MPC8540 datasheet(950/1302 Pages) FREESCALE

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

17-26

Freescale Semiconductor

RapidIO Interface

17.3.1.14 Host Base Device ID Lock Command and Status Register

(HBDIDLCSR)

The host base device ID lock CSR, shown in Figure 17-16, contains the base device ID value for

the processing element in the system that is responsible for initializing this processing element.

HBDID is a write-once/resettable field that provides a lock function. After HBDID is written,

subsequent writes to the field are ignored, except when the written value matches the value

contained in the field. In this case, the register is reinitialized to 0xFFFF. After HBDID is written,

a processing element must then read the host base device ID lock CSR to verify that it owns the

lock before attempting to initialize this processing element.

Table 17-20 describes the fields of the HBDIDLCSR.

17.3.1.15 Component Tag Command and Status Register (CTCSR)

The CTCSR contains a component tag value for the RapidIO block and can be assigned by

software when the device is initialized. Figure 17-17 shows the CTCSR.

015 16

R 0

HBDID

Reset

0000_0000_0000_0000_1111_1111_1111_1111

Offset

0xC_0068

Figure 17-16. Host Base Device ID Lock Command and Status Register (HBDIDLCSR)

Table 17-20. HBDIDLCSR Field Descriptions

Bits

Name

Description

0–15

—

Reserved

16–31

HBDID Host base device ID. This is the base device ID for the processing element that is initializing this

processing element. When unlocked, this field is write-able and locks immediately after being written.

When locked, this field is only write-able when written with the value it already contains, at which point

it becomes unlocked.

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0xC_006C

Figure 17-17. Component Tag Command and Status Register (CTCSR)

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