PM9313 datasheet(83/343 Pages) PMC

83 / 343 page

PM9311/2/3/5 ETT1™ CHIP SET

PMC-2000164

ISSUE 3

ENHANCED TT1™ SWITCH FABRIC

Released

Data Sheet

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

PMC-Sierra, Inc.

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.

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:

The current multicast groups are shown in Table 18.

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.

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

Multicast device selects. (15 multicast groups). See Table 18 below for groups.

0x0 to 0x7EF

Individual device selects. See Table 19 for details of one possible address

scheme.

Table 18.

Multicast Group Selects

Group

Device select value (11bits)

All EPPs

0x7FE

All Dataslices

0x7FD

All Schedulers

0x7FC

All Crossbars

0x7FB

All Satellites (Not part of the ETT1 Chip Set)

0x7F0

Global Device Select (11b)

Sub-address (20b)

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