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CS7808-CM Datasheet(PDF) 42 Page - Cirrus Logic

Part No. CS7808-CM
Description  MULTI PURPOSE AUDIO/VIDEO EMBEDDED PROCESSOR
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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CS7808-CM Datasheet(HTML) 42 Page - Cirrus Logic

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CS7808
42
6.4
ROM/NVRAM Interface
This is the interface to the non-volatile memory that contains the firmware. See Table 19. It could be either
ROM, NVRAM – FLASH, or EEPROM, or any combination of these types of memory. This interface can
also connect to SRAM that would emulate a ROM on a development system. The bus width is 8 or 16 bits.
Except for the NVM_WE_N and NVM_OE_N pins, all these pins are shared with the DRAM interface,
which operates simultaneously with the ROM/NVRAM interface.
Pin
Signal Name
Type
Description
60, 56, 54, 49,
46, 44, 40, 33,
37, 42, 45, 48,
51, 55, 59. 62
M_D[15..0]
B
Memory Data Bus. Use M_D[7:0] for 8-bit interface
2, 3, 5, 6, 7, 9,
10, 11, 13, 14,
15, 16
M_A[11..0]
O
Memory Address Bus[11..0]
74, 71, 68, 64,
67, 70, 72, 75,
78, 80, 86, 88
M_D[27..16]
O
Memory Address Bus[23..12]
For
16-bit data mode, M_D[26:16] is upper word address.
For 8-bit data mode, M_D[27:16] is upper byte address.
83
M_D[30]
O
Address decode low. Copy of address MSB.
87
M_D[31]
O
Address decode high. Compliment of address MSB.
60
NVM_WE_N
O
NVRAM Write Enable.
62
NVM_OE_N
O
ROM/NVRAM Output Enable.
Table 19. ROM/NVRAM Interface


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