PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
Register 0769H: RXSDQ FIFO Indirect Configuration
Bit
Type
Function
Default
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
ENABLE
0
0
0
0
0
0
0
0
0
1
X
0
0
0
0
0
POS_SEL
FIFO_NUMBER[5]
FIFO_NUMBER[4]
FIFO_NUMBER[3]
FIFO_NUMBER[2]
FIFO_NUMBER[1]
FIFO_NUMBER[0]
FIFO_BS[1]
Bit 8
Bit 7
Bit 6
FIFO_BS[0]
Bit 5
Unused
Bit 4
R/W
R/W
R/W
R/W
R/W
BLOCK_PTR[4]
BLOCK_PTR[3]
BLOCK_PTR[2]
BLOCK_PTR[1]
BLOCK_PTR[0]
Bit 3
Bit 2
Bit 1
Bit 0
BLOCK_PTR[4:0]:
This is a 5-bit number that is calculated and programmed by the user based on the number of
PHYs, the size of each FIFO, and total number of FIFOs required by the system. The rules
governing this calculation are in the Operations Section.
FIFO_BS[1:0]:
This 2-bit number denotes the size in Blocks of FIFO for the PHYID specified in the RXSDQ
FIFO Indirect Address register. The bandwidth is related to the size of the FIFO that will be
allocated to the PHY. The values to be programmed are given in the operations section.
FIFO_NUMBER[5:0]:
This is a 6-bit internal FIFO number that is used to associate a given PHY ID with a FIFO.
This allows the user to flexibly use the SDQ to map any FIFO of any size to any PHY ID. The
values to be programmed are given in the operations section.
POS_SEL:
This bit is set to 1 if the FIFO needs to be configured as a packet FIFO. By default, the FIFOs
are configured as ATM cell FIFOs.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
343
PMC [ PMC-SIERRA, INC ]
