QT2032PRKCB Datasheet, PDF (88/220 Pages) Applied Micro Circuits Corporation – 10 Gb/s Serial-to-XAUI PHY ICs for Ethernet and Fibre Channel LAN/ SAN/WAN Applications (CDR)

QT2022/32 - Data Sheet: DS3051
A AMCC-specific DOM write command has been added. The write control is via MDIO vendor specific register
1.C004h. The write can be a full 256 byte write or a single byte write to the address specified in MDIO register bits
1.C002h.7:0. The write command status registers have been added to the unused/undefined upper bits of the
DOM read command register. This allows for clearing of either read or write command failures with a single MDIO
register read. The QT2022/32 EEPROM_PROT pin must be pulled low to enable writing to the DOM MDIO regis-
ters and to the DOM device registers.
Table 36: DOM Control Registers
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PMA/PMD Vendor Specific
DOM Control/Status Register
1.A100h
DOM Read Commands / Update Rate (R/W)
bit1 bit0 Command
0 0 write of 00 initiates a single update of MDIO DOM registers
0 1 periodic update of MDIO DOM registers every 60 seconds
1 0 periodic update of MDIO DOM registers every 10 seconds
1 1 periodic update of MDIO DOM registers every 1 second
DOM Read Command Status (RO, LH)
bit3 bit2 Command Status
0 0 no command
0 1 command completed
1 0 command in progress
1 1 previous command failed
reserved (RO)
reserved (RO)
reserved (RO)
reserved (RO)
reserved (RO)
reserved (RO)
reserved (RO)
reserved (RO)
DOM Write Command Status (RO, LH)
bit 13 bit12 Command status
00
no command
01
command completed
10
command in progress
11
previous command failed
reserved (RO)
reserved (RO)
PMA/PMD Vendor Specific
EEPROM Checksum/
DOM Write Control Register
1.C004h
DOM Write Command (R/W)
bit 11 bit10 Command
00
idle, default
01
reserved
10
write 1 byte
11
write 256 bytes
DOM 256 byte write cycle burst size (R/W)
size bit 15 bit14
10
0
80
1 default
16 1
0
11
1
reserved (RO)
reserved (RO)
reserved (RO)
reserved (RO)
reserved (RO)
EEPROM calculated checksum
(RO)
Before doing a DOM MDIO register write and subsequent DOM device write, the DOM must be idle and not be in
periodic update mode. This is to ensure that a DOM read does not overwrite the DOM MDIO registers before data
has been transferred to the DOM device.
If a DOM (NVR) device access is queued and an NVR (DOM) device access which is in progress fails, then the
NVR (DOM) command failure flag is set and the DOM (NVR) device access is allowed to proceed. No NVR (DOM)
commands are accepted while the NVR (DOM) command failure state is set. this state must be cleared before
another NVR (DOM) command can take place.
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