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SAA7385 Datasheet(PDF) 22 Page - NXP Semiconductors

Part No. SAA7385
Description  Error correction and host interface IC for CD-ROM SEQUOIA
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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SAA7385 Datasheet(HTML) 22 Page - NXP Semiconductors

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1996 Jun 19
22
Philips Semiconductors
Preliminary specification
Error correction and host interface IC for
CD-ROM (SEQUOIA)
SAA7385
Table 12 Microcontroller address page register: 0xF0FF
Note
1. PAGE_EN is disconnected.
Register 0xF0FF is used by the buffer manager for the upper address lines when the microcontroller addresses
non-frame memory. These registers overlap frame memory, so register 0xF0FF must be programmed with an address
in the top part of the memory if no overlap is required. The microcontroller page address line is selected from this register.
The outputs are used directly to control DRAM access cycles, and will affect any current DRAM cycle in progress.
It is possible to access three contiguous frames from the microcontroller by reading the three data sector windows,
0x8000 to 0x8FFF, 0x9000 to 0x9FFF and 0xA000 to 0xAFFF. This function is required for the decoding of the sub-code
information. If the ‘next’ frame wraps past the last frame pointer (LASTFRM) then the pointers are modified to wrap back
to the start pointer onwards (FEFRM#); this section is transparent to the microcontroller.
Table 13 Program memory control register: 0xF09F
Register 0xF09F controls a system test feature where an SRAM is used for the 80C32 external program memory;
note DATAPRG must be set for any of these features to be enabled.
Table 14 PRGMEM field descriptions
MNEMONIC
R/W
DATA BYTE
76
5
43210
PAGEREG
R/W
−−
PAGE_EN(1)
MA_19
MA_18
MA_17
MA_16
MA_15
MNEMONIC
R/W
DATA BYTE
765
4
3
2
1
0
PRGMEM
R/W
DATAPRG
EN_WIN
SEL_TOP
INV_A15
−−−−
FIELD
LOGIC
DESCRIPTION
INV_A15
0
normal operation
1
invert A(15) to program memory for data memory access
SEL_TOP
0
select bottom 32 kbyte window
1
select top 32 kbyte window
EN_WIN
0
windowing disabled
1
32 kbyte windows are enabled and SEL_TOP is used to determine window selected
DATAPRG
0
normal operation
1
data memory is mapped to program memory and data memory DRAM accesses are
disabled


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