Intel IXF1104 - page 223

Intel® IXF1104 4-Port Gigabit Ethernet Media Access Controller
223 Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
Table 155. I2C Control Ports 0 - 3 ($0x79B)
Bit Name Description Type1Default
Register Description: This register controls and monitors the interf ace to the optical modules
when used in fiber mode. 0x00000000
31:29 Reserved Reserved RO 0x0
28 Port address Err (R) Port addressing error. R 0
27 wp_err An attempt to write to the protected E2PROM has
occurred. R0
26 no_ack_err
This bit is set to 1 when a write and subsequent
read from an Optical Module In terface has failed.
This signal should be used to val idate the data
being read. Data is only valid if this bit is equal to
zero.
R0
25 I2C_enable Enable the I2C block. R/W 0
24 I2C_start Start the I2C transfer. R/W 0
23 Reserved Reserved RO 0
22 write_complete Bit is asserted when write access is complete. R 0
21 Reserved Reserved RO 0
20 Read_complete Bit asserted when read access is complete. R 0
19:18 Reserved Reserved RO 0
17:16 Port Select Selects the port for which the I2C transaction is
targeted. Valid range is 0 to 3. R/W 00
15 Read/Write 0 = Write transaction
1 = Read transaction R/W 0
14:11 Device I D Most-significant four bi ts of device address f ield. R/W 0x0
10:0 Register Address Bits 10:8 select the least-significant three bits of
the device address field
Bits 7:0 select the wor d/register address R/W 0x000
1.RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No
clear; R/W/C = Read/Write, Clear on Write
Table 156. I2C Data Ports 0 - 3 ($0x79F)
Bit Name Description Type1Default
Register Description: These registers hold data bytes that are read and wri tten using the I2C
interface to Optical Module Interfaces connected to each port of the Intel® IXF1104 4-Port
Gigabit Ethernet Media Access Controller. 0x00000000
31:24 Reserved Reserved RO 0x00
23:16 Write Data Bit 23=MSB, Bit 16 = LSB
Data to be written to the Optical Module Interface. R/W 0X00
15:8 Reserved Reserved RO 0x00
7:0 Read Data Bit 7 = MSB, Bit 0 = LSB
Data read from the Op tical Module Interface. R/W 0X00
1.RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No
clear; R/W/C = Read/Write, Clear on Write