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9-20
MPC8240 Integrated Processor User’s Manual
I
2
O Interface
Figure 9-18 shows the bits of the OPTPR.
Figure 9-18. Outbound Post_FIFO Tail Pointer Register (OPTPR)
Table 9-22 shows the bit settings for the OPTPR.
9.3.4.2.11 Messaging Unit Control Register (MUCR)
The MUCR allows software to enable and set up the size of the inbound and outbound
FIFOs. Figure 9-19 shows the bits of the MUCR.
Figure 9-19. Messaging Unit Control Register (MUCR)
Table 9-23 shows the bit settings for the MUCR.
Table 9-22. OPTPR Field Descriptions— Offset 0x0_0158
Bits
Name
Reset
Value
R/W
Description
31–20
QBA
All 0s
R
Queue base address. When read, this field returns the contents of QBAR[31–20].
19–2
OPTP
All 0s
RW
Outbound post_FIFO tail pointer. Maintains the local memory offset of the tail
pointer of the outbound post_list FIFO.
1–0
—
00
R
Reserved
Table 9-23. MUCR Field Descriptions— Offset 0x0_0164
Bits
Name
Reset
Value
R/W
Description
31–6
—
All 0s
R
Reserved
5–1
CQS
0b0_0001
RW
Circular queue size
0b0_0001: 4K entries (16 Kbytes)
0b0_0010: 8K entries (32 Kbytes)
0b0_0100: 16K entries (64 Kbytes)
0b0_1000: 32K entries (128 Kbytes)
0b1_0000: 64K entries (256 Kbytes)
0
CQE
0
RW
Circular queue enable
0 PCI writes to IFQPR and OFQPR are ignored and reads return
0xFFFF_FFFF.
1 Allows PCI masters to access the inbound and outbound queue ports (IFQPR
and OFQPR). Usually, this bit is set only after software has initialized all
pointers and configuration registers.
QBA
OPTP
0 0
31
20 19
2
1
0
Reserved
0 0 0 0_0 0 0 0_0 0 0 0_0 0 0 0_0 0 0 0_0 0 0 0_0 0
CQS
31
6
5
1
0
Reserved
CQE
Содержание MPC8240
Страница 1: ...MPC8240UM D Rev 1 1 2001 MPC8240 Integrated Processor User s Manual ...
Страница 38: ...xviii MPC8240 Integrated Processor User s Manual TABLES Table Number Title Page Number ...
Страница 48: ...xlviii MPC8240 Integrated Processor User s Manual Acronyms and Abbreviations ...
Страница 312: ...6 94 MPC8240 Integrated Processor User s Manual ROM Flash Interface Operation ...
Страница 348: ...7 36 MPC8240 Integrated Processor User s Manual PCI Host and Agent Modes ...
Страница 372: ...8 24 MPC8240 Integrated Processor User s Manual DMA Register Descriptions ...
Страница 394: ...9 22 MPC8240 Integrated Processor User s Manual I2O Interface ...
Страница 412: ...10 18 MPC8240 Integrated Processor User s Manual Programming Guidelines ...
Страница 454: ...12 14 MPC8240 Integrated Processor User s Manual Internal Arbitration ...
Страница 466: ...13 12 MPC8240 Integrated Processor User s Manual Exception Latencies ...
Страница 516: ...16 14 Watchpoint Trigger Applications ...
Страница 538: ...B 16 MPC8240 Integrated Processor User s Manual Setting the Endian Mode of Operation ...
Страница 546: ...C 8 MPC8240 Integrated Processor User s Manual ...
Страница 640: ...INDEX Index 16 MPC8240 Integrated Processor User s Manual ...