PM7375-SC datasheet(44/430 Pages) PMC

44 / 430 page

PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

IDSEL

Input

The initialization device select (IDSEL) signal is used

as the chip select during PCI configuration register

reads and writes. When high during the address

phase of a transaction with the C/BEB[3:0] code

indicating a register read or write, the LASAR-155

assumes a PCI configuration register transaction. In

response, the LASAR-155 asserts the DEVSELB

signal in the subsequent PCICLK period.

IDSEL is sampled using the rising edge of PCICLK.

DEVSELB

I/O

The device select (DEVSELB) signal is forced low by a

target to claim the current bus transaction. During the

address phase of a transaction, all targets decode the

address on the AD[31:0] bus. If a target recognizes

the address as its own, it forces DEVSELB low to

indicate to the initiator that the address is valid. If no

target claims the address in six bus clock cycles, the

initiator must assume that the target does not exist or

cannot respond and must abort the transaction.

When the LASAR-155 is the initiator, DEVSELB is an

input. If no target responds to an address in six

PCICLK cycles, the LASAR-155 aborts the current

transaction and alerts the PCI Host via an interrupt.

When the LASAR-155 is the target, DEVSELB is an

output.

DEVSELB is updated on the rising edge of PCICLK or

sampled using the rising edge of PCICLK depending

on whether it is an output or an input. When the

LASAR-155 is not involved in the current transaction,

DEVSELB is tri-stated.

LOCKB

Input

The active low bus lock (LOCKB) signal is used to lock

a target device. When LOCKB is low, FRAMEB is low

and the LASAR-155 is the target, an initiator is locking

the LASAR-155 as an "owned" target. Under these

circumstances, the LASAR-155 will reject all

transaction with other initiators. The LASAR-155 will

continue to reject other initiators until its owner

releases the lock by forcing both FRAMEB and

LOCKB high. As an initiator, the LASAR-155 never

locks a target.

LOCKB is sampled using the rising edge of PCICLK.

PM7375-SC Datasheet(PDF) 44 Page - PMC-Sierra, Inc

PM7375-SC Datasheet(HTML) 44 Page - PMC-Sierra, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL