80 lines
3.3 KiB
Markdown
80 lines
3.3 KiB
Markdown
# FS SFP-10G-T-100 transport reference — transcription
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Transcribed (visually, tables intact) from the FS-provided 4-page
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`10GBase-T Coper SFP Registers Operation's Reference for BCM84891.pdf`
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(an ODM document — PDF metadata titles it "ABCU-5710RZ / ABCU-5700RZ").
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## 1. Serial ID memory (A0h)
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Standard SFP MSA serial ID at I2C A0h. Notable factory values (the module is
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honest about copper — cf. hardware.md):
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| Addr | Field | Value | Meaning |
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|---|---|---|---|
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| 0 | Identifier | 03 | SFP |
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| 1 | Ext. identifier | 04 | MOD4 |
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| 2 | Connector | 21 | Copper pigtail (the shipped unit reads 22 = RJ45) |
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| 3–10 | Transceiver | 02 00 00 00 00 08 00 00 | 10G Base-XFI to copper / SGMII to copper |
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| 11 | Encoding | 00 | 64B/66B (or 8B/10B) |
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| 12 | BR, nominal | 67 | 10.3125 GBd |
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| 18 | Length (copper) | 64 | 100 m; 30 m minimum in-spec copper length |
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| 20–35 | Vendor name | "OEM " | shipped unit reads "FS" |
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| 40–55 | Vendor PN | "10GBase-T C100m" | shipped unit reads "SFP-10G-T-100" |
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| 64–65 | Options | 00 12 | TX_DISABLE and RX_LOS implemented (shipped: 00 1A) |
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| 92 | Diag monitoring | 00 | **no A2h DOM implemented** |
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| 93 | Enhanced options | 00 | |
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| 94 | SFF-8472 compliance | 00 | digital diagnostics not included |
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| 96–127 | Vendor specific | all 00 | |
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## 2–3. SMI (I2C→MDIO) protocol for the PHY, with timing
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The PHY is a 2-wire device at 8-bit address **0xAC write / 0xAD read**
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(`1010110x`). Clause-45 access frames:
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**Write (one I2C frame, 6 bytes):**
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`S [0xAC] [000+DEVAD] [Reg_H] [Reg_L] [Data_H] [Data_L] P`
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**Read (two I2C frames):**
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`S [0xAC] [001+DEVAD] [Reg_H] [Reg_L] P` → **delay > 1 ms** →
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`S [0xAD] [Data_H] [Data_L] P`
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Bit-level example diagrams confirm: every byte is slave-ACKed except the final
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read data byte, which the master **NAKs** before STOP. Worked examples: write
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0x55AA to 1.0xA820; read 0x8542 from 1.0x0003.
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## 4. PHY MMD map
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Clause-45 MMDs behind the bridge:
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| DEVAD | Block |
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|---|---|
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| 1 | 10GBASE-T PMA/PMD |
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| 3 | 10GBASE-T PCS; XFI_M (XGMII) block also on DEVAD 3 |
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| 7 | AN; SGMII block and 10/100/1000BASE-T PCS/PMA/PMD at 7.0xFFE0–0xFFFF |
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| 30 | Top level (user-defined) |
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Side blocks: JTAG, SPI, BSC, PLL/clock, LED controller.
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## 5. Reference access commands and 10G bring-up sequence
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The ODM's host-side primitives are exactly our `sff_i2c` ops:
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`Write_XGPHY_Register 0xAC [000+DEVAD] RegH RegL DataH DataL` and
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`Read_XGPHY_Register 0xAC [001+DEVAD] RegH RegL, >1 ms, 0xAD DataH DataL`.
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Reference sequence "set PHY to work in 10GBE rate" (write in order):
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| Frame | Register = value | Meaning |
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|---|---|---|
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| AC 01 00 00 20 40 | 1.0 = 0x2040 | PMA control: 10G speed select |
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| AC 01 00 07 00 09 | 1.7 = 0x0009 | PMA control 2: 10GBASE-T type |
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| AC 07 00 10 10 01 | 7.16 = 0x1001 | AN advertisement |
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| AC 07 00 20 10 03 | 7.32 = 0x1003 | 10GBASE-T AN control |
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| AC 07 00 3C 00 08 | 7.60 = 0x0008 | **EEE advertisement — advertises 10GBASE-T EEE** |
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| AC 07 00 40 00 00 | 7.64 = 0x0000 | |
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| AC 07 80 00 00 10 | 7.0x8000 = 0x0010 | vendor AN register |
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| AC 07 00 00 B2 00 | 7.0 = 0xB200 | AN control: enable + restart |
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The EEE-advertisement line means the reference bring-up (and possibly the module
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firmware's own defaults) leaves 10GBASE-T EEE negotiable — verify and disable
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for measurement runs (see modules.md probe list).
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