216 lines
9.4 KiB
Markdown
216 lines
9.4 KiB
Markdown
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# BCM84891L MDIO command handler — transcription
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Transcribed (visually, tables intact) from the FS-provided excerpt of the Broadcom
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datasheet `84891L-DS101` (`BCM84891L-MDIO Command Descriptions-.pdf`). The excerpt
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keeps the cover, TOC, and datasheet pages 41–59. Chapters the TOC lists but the
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excerpt **omits** — each a potential follow-up ask to FS:
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- §1.17 EEE / AutogrEEEn (enable/disable, **monitoring EEE readiness**, fast retrain
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modes: IEEE FR, Negotiated FR, BCM-proprietary FR)
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- §1.18 Jumbo packets, §1.19 HiGig2
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- §1.20 Loopback operation — per-speed PCS loopbacks and **copper line loopback at
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PMD/PCS** (§1.20.2)
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- §1.21 Management interface, §1.22 TRD (MDI) pair swapping, §1.23 SPI
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- **Chapter 2: Register Summary** (p62+)
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- Not in the TOC at all: the ECD chapter and the 1588 operation chapter.
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Device headline features (cover page): IEEE 1588-2008 v2-compliant; IEEE fast retrain
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and link monitoring; EEE with AutogrEEEn; enhanced cable diagnostics; detection and
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correction of pair swaps (MDI crossover), pair skew, and pair polarity; line-side
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loopback; jumbo to 18 KB; low-EMI; XFI/USXGMII/KR host interfaces.
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## Handler protocol (§1.24)
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Write the command code to CMD `1E.0x4005` with bit 15 set; firmware raises an
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interrupt, services the command, and reports through STATUS `1E.0x4037`
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(bidirectional — user-writable). Poll STATUS every ~100 ms. During the 2-second
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10GBASE-T training phase STATUS freezes (returns SYSTEM_BUSY); only issue commands
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after link-up.
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| Register | Address |
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|---|---|
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| CMD | 1E.0x4005 |
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| STATUS | 1E.0x4037 |
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| DATA1–DATA5 | 1E.0x4038–1E.0x403C |
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| STATUS code | Value |
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|---|---|
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| CMD_RECEIVED | 0x0001 |
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| CMD_IN_PROGRESS | 0x0002 |
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| CMD_COMPLETE_PASS / OPEN_FOR_CMDS | 0x0004 |
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| CMD_COMPLETE_ERROR / OPEN_FOR_CMDS | 0x0008 |
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| CMD_SYSTEM_BUSY | 0xBBBB |
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Procedure: poll STATUS until neither IN_PROGRESS nor BUSY → write params to DATAn →
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write code\|0x8000 to CMD → poll STATUS for PASS/ERROR → read DATAn results.
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Provisioning changes generally require an AN restart to take effect.
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**Field note (hardware-verified):** the handler does not clear DATA registers it
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doesn't use — stale values persist across commands. GET_SNR must be invoked with
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*no* DATA1 write (see its entry).
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## Table 5 — command codes (verified against hardware)
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| Command | Code | Notes |
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|---|---|---|
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| CMD_GET_PAIR_SWAP | 0x8000 | |
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| CMD_SET_PAIR_SWAP | 0x8001 | needs AN restart |
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| Reserved | 0x8002, 0x8003 | |
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| CMD_GET_1588_ENABLE | 0x8004 | |
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| CMD_SET_1588_ENABLE | 0x8005 | needs AN restart |
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| GET_LIMITED_REACH_MODE_ENABLE | 0x8006 | |
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| SET_LIMITED_REACH_MODE_ENABLE | 0x8007 | |
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| CMD_GET_EEE_MODE | 0x8008 | |
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| CMD_SET_EEE_MODE | 0x8009 | needs AN restart |
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| CMD_GET_EMI_MODE_ENABLE | 0x800A | **description says: gets SW fast-retrain enable** |
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| CMD_SET_EMI_MODE_ENABLE | 0x800B | **sets fast-retrain enables; needs AN restart** |
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| CMD_GET_SUB_LF_RF_STATUS | 0x800D | |
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| GET_KR_MODE_ENABLE | 0x800E | |
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| SET_KR_MODE_ENABLE | 0x800F | |
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| CMD_CLEAR_SUB_LF_RF | 0x8010 | |
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| CMD_SET_SUB_LF_RF | 0x8011 | |
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| GET_SYNC_E_ENABLE | 0x8012 | |
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| SET_SYNC_E_ENABLE | 0x8013 | |
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| GET_XFI_2P5G_5G_MODE | 0x8016 | |
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| SET_XFI_2P5G_5G_MODE | 0x8017 | |
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| SET_EEE_STATISTICS | 0x801A | arm counters; issue after link-up |
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| GET_EEE_STATISTICS | 0x801B | |
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| GET_JUMBO_PACKET | 0x801D | note: GET is 1D |
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| SET_JUMBO_PACKET | 0x801C | note: SET is 1C |
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| GET_PAUSE_FRAME_MODE | 0x801F | WAP/idle-stuffing niche only |
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| SET_PAUSE_FRAME_MODE | 0x8020 | WAP/idle-stuffing niche only |
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| GET_LED_TYPE | 0x8021 | |
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| SET_LED_TYPE | 0x8022 | |
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| GET_WAP_MODE_FRAME_TYPE | 0x8023 | |
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| SET_WAP_MODE_FRAME_TYPE | 0x8024 | |
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| SET_USXGMII | 0x8026 | |
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| GET_USXGMII | 0x8027 | |
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| GET_XFI_TX_FILTERS | 0x802B | |
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| SET_XFI_TX_FILTERS | 0x802C | |
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| GET_XFI_POLARITY | 0x802D | |
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| SET_XFI_POLARITY | 0x802E | |
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| GET_CURRENT_VOLTAGE | 0x802F | |
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| CMD_GET_SNR | 0x8030 | |
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| CMD_GET_CURRENT_TEMP | 0x8031 | |
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| CMD_SET_UPPER_TEMP_WARNING_LEVEL | 0x8032 | |
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| CMD_GET_UPPER_TEMP_WARNING_LEVEL | 0x8033 | |
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| CMD_SET_LOWER_TEMP_WARNING_LEVEL | 0x8034 | |
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| CMD_GET_LOWER_TEMP_WARNING_LEVEL | 0x8035 | |
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| SET_WOL_ENABLE | 0x805A | |
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| GET_WOL_ENABLE | 0x805B | |
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## Command semantics
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### CMD_GET_PAIR_SWAP (0x8000) / CMD_SET_PAIR_SWAP (0x8001)
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GET: DATA1 = forced/requested swap value, DATA2 = current swap value.
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SET: DATA2 = value to force; needs AN restart.
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Encoding (Table 8): bits [7:6] PAIR_D_SEL, [5:4] PAIR_C_SEL, [3:2] PAIR_B_SEL,
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[1:0] PAIR_A_SEL; each 2-bit field: 00=Pair A, 01=B, 10=C, 11=D.
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### CMD_GET/SET_1588_ENABLE (0x8004/0x8005)
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DATA1: 0 = IEEE 1588 disabled, 1 = enabled. Set prior to link-up (or bounce the
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link via AN restart). The 1588 engine's own registers are not documented in this
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excerpt.
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### GET/SET_LIMITED_REACH_MODE_ENABLE (0x8006/0x8007)
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DATA1: 0 = LR mode disabled, 1 = enabled.
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DATA2 (when enabled): 0 = dynamically switch to LR power-saving level 2 **based on
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cable length**; 1/2/3 = forced level 1 (most saving) / 2 / 3 (least).
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GET-only DATA3: 1 = currently linked in limited-reach mode — the sole
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handler-visible consequence of the DSP's internal length estimate.
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### CMD_GET_EEE_MODE (0x8008) / CMD_SET_EEE_MODE (0x8009)
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Per-speed EEE mode fields in DATA1 — 10G in bits [1:0], 1G/100M in [3:2]
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(interpreted per bits [11:10]), 2.5G in [5:4], 5G in [7:6]:
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0 = EEE disabled, 1 = native EEE, 2 = AutogrEEEn fixed latency,
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3 = AutogrEEEn variable latency.
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DATA2 = AutogrEEEn high threshold, DATA3 = low threshold (default 0x7A12),
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DATA4 = AutogrEEEn latency (default 0x480); shared across 2.5/5/10G, ignored at 10G
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native. SET needs AN restart.
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### CMD_GET/SET_EMI_MODE_ENABLE (0x800A/0x800B)
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Datasheet titles say EMI; both descriptions read "SW Fast Retrain enable":
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DATA1 = 10G fast retrain (0/1), DATA2 = 5G, DATA3 = 2.5G. SET needs AN restart.
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### CMD_GET_SUB_LF_RF_STATUS (0x800D), CLEAR (0x8010), SET (0x8011)
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Substitution of local/remote fault codes with IDLE toward the line direction.
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GET DATA1: 0 = copper-TX LF/RF passes through, 1 = LF/RF replaced with IDLE.
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SET enables substitution, CLEAR disables it.
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### GET/SET_KR_MODE_ENABLE (0x800E/0x800F)
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DATA1: KR mode on the host interface, 0/1. (KR unsupported when 2500X/5000X mode
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is enabled.)
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### GET/SET_SYNC_E_ENABLE (0x8012/0x8013)
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DATA1 SyncE enable; DATA2/DATA3 M0/M1 recovered-clock mux select (P0 10G, P1–P3
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10G/1G, or P0 1G); DATA4 FW-vs-user control; DATA5 bits [1:0] M0/M1 output
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disable.
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### GET/SET_XFI_2P5G_5G_MODE (0x8016/0x8017)
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Rate adaptation for 2.5G/5G on the host side: 0 = 10G idle-stuffing, 1 = X mode,
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2 = R mode (per speed in DATA1/DATA2).
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### SET_EEE_STATISTICS (0x801A) / GET_EEE_STATISTICS (0x801B)
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SET arms the statistics (no params; issue after link-up). GET input selector:
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0 = event counters, 1 = time durations. Returns TX(LOC) counter/time in
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DATA2 (low 16) / DATA3 (high 16) and RX(REM) in DATA4/DATA5. PHY picks the
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10G or 1G counter bank from current link speed.
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### GET/SET_JUMBO_PACKET (0x801D/0x801C)
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DATA1 enable; DATA2 size option 0 = 10K, 1 = 18K, 2 = 9K.
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### GET/SET_PAUSE_FRAME_MODE (0x801F/0x8020)
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DATA1: 0 = no pause frame, 1 = enabled. **Only valid for 2.5/5G idle-stuffing in
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10G XFI WAP mode** — inert in plain 10G operation.
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### GET/SET_LED_TYPE (0x8021/0x8022)
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DATA1: 0 = firmware control, 1 = user control.
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### GET/SET_WAP_MODE_FRAME_TYPE (0x8023/0x8024)
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GET: DATA1 = 1 when priority protocol is IEEE 802.3bz; DATA2 current link frame
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type (1 = 802.3bz, 2 = NBASE-T). SET: DATA1 frame-type priority.
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### SET/GET_USXGMII (0x8026/0x8027)
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DATA1 enable; DATA2 USXGMII autoneg; DATA3 [2:0] single_max_speed (1 = 2.5G,
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2 = 5G, 4 = 10G); DATA5: 1 = MAC/PHY frequency unlocked, 0 = locked.
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### GET/SET_XFI_TX_FILTERS (0x802B/0x802C)
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Host-side XFI TX FIR taps. GET (for the current link speed; invalid if link
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down): DATA2 [7:0] pre tap / [15:8] main tap; DATA3 [7:0] post1 / [15:8] post2;
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DATA4 [15:8] TX HPF. SET adds DATA1 [15:8] speed selector (0 = 10G
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backward-compat, 1 = 100BT, 2 = 1G, 3 = 10G, 4 = 2.5G, 5 = 5G).
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### GET/SET_XFI_POLARITY (0x802D/0x802E)
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DATA2 TX polarity, DATA3 RX polarity.
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### GET_CURRENT_VOLTAGE (0x802F)
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DATA1/DATA2 = 0.8 V rail measurements, DATA3 = 1.88 V rail. (Observed: tenths of
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mV — 0x1E47 ≈ 775.1 mV, 0x49BC ≈ 1887.6 mV.)
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### CMD_GET_SNR (0x8030)
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Documented: DATA1 input 0/1 = display SNR in IEEE registers; returns DATA2–5 =
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SNR for channels A–D in dB×10. **Hardware-verified behavior: write nothing to
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DATA1** — writing the display flag (either value) makes this firmware return
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zeros, and the IEEE registers 1.133–1.140 never populate (constant 0x8080)
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regardless. Bare invocation returns live per-pair SNR (~27–32 dB on a bench
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cable, 0.1–0.4 dB jitter per read). Values are absolute receiver SNR.
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### CMD_GET_CURRENT_TEMP (0x8031)
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DATA1 = die temperature (°C; observed ~68–70 on bench).
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### Temp warning levels (0x8032–0x8035)
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Upper/lower limit in °C (two's complement) in DATA1, margin in DATA2, enable in
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DATA3.
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### SET/GET_WOL_ENABLE (0x805A/0x805B)
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DATA1: 0/1. SET takes effect immediately; soft-reset the PHY afterward. Only
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relevant at 2.5G and above.
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## LED programmability (§1.26)
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LED control words live in top-level vendor registers **1.0xA83B (LED Control)**
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and **1.0xA83C (LED Control Source)** — five programmable LEDs, per-LED source
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masks, 2-bit mode fields (off / blink-on-source / on-on-source), activity
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sources: bit 1 RX activity, bit 2 TX activity, with a stretch enable for
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visibility. (First documented vendor registers outside the handler; the SMI
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example in the registers reference writes another one, 1.0xA820.)
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