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參數(shù)資料
| 型號(hào)： | SAA7381 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | ATAPI CD-R block decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP144 |
| 文件頁數(shù)： | 58/108頁 |
| 文件大小： | 380K |
| 代理商： | SAA7381 |
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1997 Aug 12
58
Philips Semiconductors
Objective specification
ATAPI CD-R block decoder
SAA7381
Table 88
The SAA7381 memory map
Notes
1.
If the SAA7381 is addressed in this area it will not access the DRAM and the data output of the sub-CPU interface
to the microcontroller is disabled. If the SAA7381 host interface has been configured for generic mode and the
address access from FFC0H to FFDFH, a chip select signal is asserted ‘zero’ on the output pin XDA1.
CPU address (bits 23 to 8) = 0. CPU address (bits 7 to 0) = address (bits 7 to 0).
Read in this segment is always from internal the SAA7381 registers. Write is to internal the SAA7381 registers and,
optionally, also to DRAM if debug is set (conf_8051, bit 1 = 1).
CPU address (bits 8 to 0) = address (bits 8 to 0). CPU address (bits 23 to 9) = subseg 1 (bits 12 to 0) + subseg 1
(12 to 0)
×
4 + address (bits 12 to 9).
CPU address (bits 9 to 0) = address (bits 9 to 0). CPU address (bits 23 to 10) = subseg 2
(bits 15 to 2) + address (bits 11 and 10).
CPU address (bits 9 to 0) = address (bits 9 to 0). CPU address (bits 23 to 10) = subseg 1
(bits 15 to 2) + address (bits 15 to 10).
2.
3.
4.
5.
6.
ADDRESS
SEGMENT SIZE
(BYTES)
USED FOR
ADDRESS FUNCTION
FFCOH to FFFFH
FF00H to FFBFH
64
192
the SAA7381s dead space
the SAA7381 register access, debug write
to DRAM
segments in DRAM
subpage 2 in DRAM
subpage 1 in DRAM
subpage 1 in DRAM
none; note 1
none; notes 2 and 3
E000H to FEFFH
D000H to DFFFH
C000H to CFFFH
0000H to BFFFH
7936
4096
4096
49152
note 4
note 5
note 6
notes 1 and 6
In fast RAM mode (see ‘CONF_8051’ bit 7) the lower 48 kbytes of RAM space is not accessible as it is reserved for external ROM.
Fig.11 Memory mapping of the SAA7381 registers into 64 kbytes sub-CPU address space.
handbook, full pagewidth
MGK511
subseg 2
subseg 1
subseg 0
subpage 2
7.5 kbits window into 3 CD-ROM blocks
base address is moved in terms of block number
4 kbits always accessible, base address movable in 256 byte pages
top 4 kbits always visible
bottom 48 kbits not usable in fast RAM mode
subpage 1
0XFF00
0XE000
0XD000
0XC000
0X0000
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