IDT
®
Six Output Differential Buffer for PCIe Gen3 1668F—10/20/16
9DB633
Six Output Differential Buffer for PCIe Gen3
10
Datasheet
SMBusTable: Device Control Register, READ/WRITE ADDRESS (D5/D4)
Pin # Name Control Function T
e0 1 Default
Bit 7
SW_EN
Enables SMBus
Control of bits
(1:0)
RW
PLL controlled
by SMBus
registers
PLL controlled
by device pins
1
Bit 6
RW X
Bit 5
RW X
Bit 4
RW X
Bit 3
RW X
Bit 2
RW X
Bit 1
PLL BW #adjust
Selects PLL
Bandwidth
RW Low BW High BW 1
Bit 0
PLL Enable
Bypasses PLL for
board test
RW
PLL bypassed
(fan out mode)
PLL enabled
(ZDB mode)
1
SMBusTable: Output Enable Register
Pin # Name Control Function T
e 0 1 Default
Bit 7
RW X
Bit 6
RW X
Bit 5
PCIEX5 Output Control RW Disable Enable 1
Bit 4
RW X
Bit 3
PCIEX3 Output Control RW Disable Enable 1
Bit 2
PCIEX2 Output Control RW Disable Enable 1
Bit 1
RW X
Bit 0
PCIEX0 Output Control RW Disable Enable 1
SMBusTable: Function Select Register
Pin # Name Control Function T
e 0 1 Default
Bit 7
RW X
Bit 6
RW X
Bit 5
RW X
Bit 4
RW X
Bit 3
RW X
Bit 2
RW X
Bit 1
RW X
Bit 0
RW X
SMBusTable: Vendor & Revision ID Register
Pin # Name Control Function T
e 0 1 Default
Bit 7
RID3 R - - 0
Bit 6
RID2 R - - 0
Bit 5
RID1 R - - 0
Bit 4
RID0 R - - 1
Bit 3
VID3 R - - 0
Bit 2
VID2 R - - 0
Bit 1
VID1 R - - 0
Bit 0
VID0 R - - 1
VENDOR ID
-
RESERVED -
RESERVED -
RESERVED
-
-
-
-
-
-
-
-
-
-
-
-
-
-
B
te 3
RESERVED
-
18,17
11,12
-
5,6
B
te 2
-
-
RESERVED -
-
-
B
te 1
-
-
RESERVED -
- RESERVED -
-
RESERVED -
RESERVED -
RESERVED
REVISION ID
-
-
-
RESERVED
RESERVED -
RESERVED -
-
RESERVED
RESERVED -
RESERVED
B
te 0
-
- RESERVED -
24,23
-
