TSI352 datasheet(21/183 Pages) IDT

21 / 183 page

1. Functional Overview

Tsi352 User Manual

80D6000_MA001_03

Integrated Device Technology

www.idt.com

1.4

Data Flow

The following sections describe the data flow through the Tsi352 device.

1.4.1

Memory Read Transactions

The conventional PCI memory read, memory read line, and memory read multiple commands are used

to transfer memory read data. Tsi352 completes all memory read transactions as delayed transactions.

Figure 3 shows the Tsi352 memory read flow.

Figure 3: Memory Read Flow

The following steps show the memory read flow through the Tsi352:

•

The read request from the initiator is posted/entered into the Non-Posted Queue

•

The transaction is terminated by signaling target retry to the initiator

•

When the target retry is received, the initiator is required to continue to repeat the same read

transaction until at least one data transfer is completed or until a master/target abort is received

•

The Tsi352 then arbitrates for the destination bus and initiates a read transaction using the exact

read address and read command

— If the Tsi352 receives retry on the target bus, it continues to repeat the read transaction until at

least one data transfer is completed, or until an error condition is encountered.

•

When the transaction is completed on the target bus, the Tsi352 transfers the data to the initiator

when the initiator repeats the transaction

When a memory read transaction targets non-prefetchable address space, the Tsi352

prefetches a single DWORD of data when the memory read command is used. For all other

read transactions, the Tsi352 prefetches data according to the prefetch algorithm (see “Read

Transactions” on page 30).

PCI

Slave

PCI

Master

Non-posted Queue

(4 entries)

Non-posted Buffer

Non-posted Queue

(4 entries)

MUX Logic

Delayed read

request

Delayed

completion on the

originating bus

Request on the

desitination bus

on behalf of the

originating bus request

Read data buffered

in the non-posted buffer

(delayed read completion

with target)

TSI352 Datasheet(PDF) 21 Page - Integrated Device Technology

TSI352 Datasheet(HTML) 21 Page - Integrated Device Technology

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