SAA7385 Datasheet, PDF (23/64 Pages) NXP Semiconductors – Error correction and host interface IC for CD-ROM SEQUOIA

Philips Semiconductors
Error correction and host interface IC for
CD-ROM (SEQUOIA)
Preliminary specification
SAA7385
handbook, halfpage ⁰⁰⁰⁰
80C32
SCRATCH PAD RAM
7FFF
8000
9000
A000
AFFF
DATA SECTOR WINDOW
(FRAME 0)
DATA SECTOR WINDOW
(FRAME 1)
DATA SECTOR WINDOW
(FRAME 2)
F000
FFFF
SAA7385
CONTROL REGISTERS
MGE398
Fig.12 Address map for the microcontroller.
Table 15 SAA7385 address map details for the 80C32
ADDRESS
0000 to 7FFF
8000 to 8FFF
9000 to 9FFF
A000-AFFF
B000-EFFF
F000-FFFF
FUNCTION
This 32 kbyte window is used to address and portion the DRAM buffer. It is intended for non-frame
mapped memory to be addressed through this window. The upper page address bits (to address the
full range of the DRAM buffer) are set by the linear address page register (PAGEREG).
All accesses to frame memory use this window to read or write to the buffer memory. The actual
address to the DRAM buffer is Micro Frame Number (MICFRM#) times 3 k plus the 12 LSBs from the
80C32.
This frame window is identical to the frame 0 window with the exception that one is added to the
value from the Micro Frame Number (MICFRM#).
This frame window is identical to the frame 0 window with the exception that two is added to the
value from the Micro Frame Number (MICFRM#).
Not used; outputs are driven LOW
SAA7385 control registers
1996 Jun 19
23