MPC8540 datasheet(947/1302 Pages) FREESCALE

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Memory Map/Register Definition

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

Freescale Semiconductor

17-23

Table 17-16 describes the fields of the PWDCSR.

2728 2930 31

R A FU EM B FA ERR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

PA PFU PEM PB 0 PE 0 0

Reset

0000_0000_0000_0000_0000_0000_0010_0000

Offset

0xC_0044

Figure 17-12. Port-Write and Doorbell Command and Status Register (PWDCSR)

Table 17-16. PWDCSR Field Descriptions

Bits

Name

Description

Available

0 Doorbell unit is not ready to accept doorbell messages. All incoming doorbell transactions return

error responses.

1 Doorbell unit is ready to accept doorbell messages

1FU

Full

0 Doorbell unit is not full

1 Doorbell unit is full. New doorbell messages are retried.

2EM

Empty

0 Doorbell unit has outstanding doorbell messages

1 Doorbell unit has no outstanding doorbell messages

Busy

0 Doorbell unit is not busy processing a doorbell message

1 Doorbell unit is busy processing a doorbell message. Incoming transactions are retried.

Failure. (Defined by the RapidIO specification but not implemented in the MPC8540.)

0 Doorbell unit has not encountered an internal error

1 Doorbell unit has encountered an internal error

5ERR

Error

0 Doorbell unit has not encountered an error condition

1 Doorbell unit encountered an error condition. Incoming doorbell transactions return error responses.

6–23

—

Reserved

Port-write unit available

0 Port-write unit is not available. All incoming port-write packets are discarded.

1 Port-write unit is initialized and ready to accept a port-write packet

PFU

Port-write unit full

0 Port-write unit is not full

1 Port-write unit is full. All incoming port-write packets are discarded.

PEM

Port-write unit empty

0 Port-write unit contains outstanding port-write data

1 Port-write unit contains no outstanding port-write data

Port-write unit busy

0 Port-write unit is not busy

1 Port-write unit is busy processing a port-write packet. Incoming port-write packets are discarded.

—

Reserved

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