PM7367 datasheet(65/323 Pages) PMC

65 / 323 page

PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

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

will perform any byte-realignment required. In order to complete a transfer

involving byte re-alignment, the GPIC may need to add an extra burst cycle to

the PCI transaction.

8.5.3 Target Machine

The GPIC target machine performs all the required functions of a stand alone

PCI target device. The target block performs three main functions. The first is

the target state machine which controls the protocol of PCI target accesses to

the GPIC. The second function is to provide all PCI Configuration registers.

Last, the target block provides a Target Interface to the CBI registers in the other

FREEDM-32P32 blocks.

The GPIC tracks the PCI bus and decodes all addresses and commands placed

on the bus to determine whether to respond to the access. The GPIC responds

to the following types of PCI bus commands only: Configuration read and write,

memory read and write, memory-read-multiple and memory-read-line which are

aliased to memory read and memory-write-and-invalidate which is aliased to

memory write. The GPIC will ignore any access that falls within the address

range but has any other command type.

After accepting a target access as a medium speed device, the FREEDM inserts

one wait state for a configuration read/write and five wait states for other

command types before completing the transaction by asserting TRDYB.

Burst accesses to the GPIC are accepted provided they are of linear type. If a

master makes a memory access to the GPIC with the lower two address bits set

to any value but "00" (linear burst type) the GPIC ignores the cycle. Burst

accesses of any length are accepted, but the FREEDM will disconnect if the

master inserts any wait states during the transaction. The FREEDM will also

disconnect on every read and write access to configuration space after

transferring one Dword of data.

Figure 9 illustrates the GPIC address space.

PM7367 数据表(PDF) 65 Page - PMC-Sierra, Inc