Released
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Bit A[31] is used to indicate the cycle type: Write or Read.
The remaining 31 bits are divided into a device select block and a sub-address block.
Global Device Select (11b)
24 23
Sub-address (20b)
0 0
0
30
16 15
8
7
The global device select block is 11 bits and is used to identify a target device. The sub-address is used by
the target device to identify a register or memory location within the device.
The device select block is divided into three categories as follows:
0x7FF
Broadcast Write. All devices should respond to this device select value but will
choose to ignore the write if they do not support a broadcast write to the specified
sub-address. All devices assert WAIT_L until their local write operation completes.
0x7F0 to 0x7FE
0x0 to 0x7EF
Multicast device selects. (15 multicast groups). See Table 18 below for groups.
Individual device selects. See Table 19 for details of one possible address
scheme.
The current multicast groups are shown in Table 18.
Table 18. Multicast Group Selects
Group
Device select value (11bits)
All EPPs
All Dataslices
0x7FE
0x7FD
0x7FC
0x7FB
0x7F0
All Schedulers
All Crossbars
All Satellites (Not part of the ETT1 Chip Set)
1.7.1.3 Individual Device Selects
The individual device selects (30:20) are hierarchical: the most significant seven bits (30:24) are the board
address and identify a single board (PCB) in the system; the four least significant bits (23:20) determine
which particular device on a board is being selected. In addition, the two most significant bits (30:29)
indicate a board type: Port board, Crossbar board or Scheduler board. Figure 33 shows this organization.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
79
PMC [ PMC-SIERRA, INC ]
