MPC8540 datasheet(1006/1302 Pages) FREESCALE

1006 / 1302 page

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

17-82

Freescale Semiconductor

RapidIO Interface

17.3.3.4.2 Port-Write Status Register (PWSR)

The port-write status register (PWSR), shown in Figure 17-79, reports various port-write

conditions after a port-write operation. Writing a 1 to a corresponding set bit clears the bit.

Figure 17-79. Port-Write Status Register (PWSR)

Table 17-81 describes the fields of the PWSR.

27–29

—

Reserved

Clear queue. Set by software after processing an inbound port-write operation. Hardware clears the

previous port-write operation from the port-write queue and clears CC. Always reads as 0 if PWE = 1.

PWE

Port-write enable

0 Port-writes are disabled.

1 The port-write controller has been initialized and can service an incoming port-write operation.

1112

23 2425 26

30 31

R 0 0000 0000 00

0 0 00 00 00 00 00

QFI

0PWB 0

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0xD_14E4

Table 17-81. PWSR Field Descriptions

Bits

Name

Description

0–10

—

Reserved

Queue full (read only)

0 The queue is not full.

1 The queue became full.

12–23

—

Reserved

Transaction error

0 No transaction error occurred

1 There was an error condition (the port-write transaction is greater than 64 bytes) during the

port-write operation. An interrupt is generated if PWMR[IEI] is set. (Bit reset, write-one-to-clear)

25–26

—

Reserved

QFI

Queue full interrupt. (Bit reset, write-one-to-clear)

0 Must be cleared by software after a port-write is serviced to re-enable the port-write controller

1 The queue became full and PWMR[QFIE] is set. An interrupt is generated.

—

Reserved

Table 17-80. PWMR Field Descriptions (continued)

Bits

Name

Description

MPC8540 Datasheet(PDF) 1006 Page - Freescale Semiconductor, Inc

MPC8540 Datasheet(HTML) 1006 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