MPC8540 datasheet(831/1302 Pages) FREESCALE

831 / 1302 page

External Signal Descriptions

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

Freescale Semiconductor

16-9

PCI_C/BE[7:0

]

Command/byte enable. Command encodings are described in Section 16.4.2.2, “PCI Bus

Commands,” and Section 16.4.3.2, “PCI-X Command Encodings.”

O As outputs for the bidirectional command/byte enable, these signals operate as described below.

State

Meanin

Asserted/Negated—During the address phase, PCI_C/BE[7:0] define the bus command.

Byte enables determine which byte lanes carry meaningful data for PCI bus data

phases. The PCI_C/BE0 signal applies to the LSB.

Timing Assertion/Negation—As specified by PCI Local Bus Specification Rev 2.2 or by PCI-X

Addendum Rev 1.0a

As inputs for the bidirectional command/byte enable, these signals operate as described below.

State

Meanin

Asserted/Negated—During the address phase, PCI_C/BE[7:0] indicate the command

that another master is sending. During the PCI bus data phase, PCI_C/BE[7:0]

indicate which byte lanes are valid.

Timing Assertion/Negation—As specified by PCI Local Bus Specification Rev 2.2 or by PCI-X

Addendum Rev 1.0a

PCI_DEVSEL

Device select

O As outputs for the bidirectional device select, these signals operate as described below.

State

Meanin

Asserted—Indicates that this PCI controller has decoded the address and is the target

of the current access.

Negated—Indicates that this PCI controller has decoded the address and is not the

target of the current access.

Timing Assertion/Negation—As specified by PCI Local Bus Specification Rev 2.2 or by PCI-X

Addendum Rev 1.0a

As inputs for the bidirectional device select, these signals operate as described below.

State

Meanin

Asserted—Indicates that some PCI agent (other than this PCI controller) has decoded

its address as the target of the current access.

Negated—Indicates that no PCI agent has been selected.

Timing Assertion/Negation—As specified by PCI Local Bus Specification Rev 2.2 or by PCI-X

Addendum Rev 1.0a

Table 16-2. PCI Interface Signals—Detailed Signal Descriptions (continued)

Signal

Description

MPC8540 Datasheet(PDF) 831 Page - Freescale Semiconductor, Inc

MPC8540 Datasheet(HTML) 831 Page - Freescale Semiconductor, 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