MPC8540 datasheet(955/1302 Pages) FREESCALE

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Memory Map/Register Definition

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

Freescale Semiconductor

17-31

17.3.1.22 Port Local AckID Status Command and Status Register (PLASCSR)

A read from the PLASCSR returns the local ackID status for both the outbound and inbound

RapidIO ports. Figure 17-24 shows the PLASCSR.

Table 17-28 describes the fields of the PLASCSR.

17.3.1.23 Port Error and Status Command and Status Register (PESCSR)

The PESCSR contains port error and status information. Figure 17-25 shows the PESCSR.

25–27

AckID status. This is the ackID status field from the link-response control symbol.

28–31

Link status. This is the link status field from the link-response control symbol.

15 16

23 24

28 29

R 0

OUTA

OBA

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0xC_0148

Figure 17-24. Port Local AckID Status Command and Status Register (PLASCSR)

Table 17-28. PLASCSR Field Descriptions

Bits

Name

Description

0–4

—

Reserved

5–7

Input port next expected ackID value

8–15

—

Reserved

16–23 OUTA Outstanding unacknowledged ackIDs. A set bit indicates that the corresponding ackID value is used

in a packet to an attached device but a corresponding acknowledge control symbol has not been

received (read-only field).

24–28

—

Reserved

29–31

OBA

Outbound ackID. Output port next transmitted ackID value. Software writing this value can force

re-transmission of outstanding unacknowledged packets ti manually implement error recovery. OBA

can only be written by software when the RapidIO port is enabled.

Table 17-27. PLMRESPCSR Field Descriptions (continued)

Bits

Name

Description

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