参数资料
型号: CS7808-CM
厂商: CIRRUS LOGIC INC
元件分类: 消费家电
英文描述: MULTI PURPOSE AUDIO/VIDEO EMBEDDED PROCESSOR
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP208
封装: MQFP-208
文件页数: 42/52页
文件大小: 985K
代理商: CS7808-CM
CS7808
42
6.4
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.
ROM/NVRAM Interface
Pin
Signal Name
M_D[15..0]
Type
B
Description
60, 56, 54, 49,
46, 44, 40, 33,
37, 42, 45, 48,
51, 55, 59. 62
2, 3, 5, 6, 7, 9,
10, 11, 13, 14,
15, 16
74,71,68,64,
67, 70, 72, 75,
78, 80, 86, 88
83
87
60
62
Memory Data Bus. Use M_D[7:0] for 8-bit interface
M_A[11..0]
O
Memory Address Bus[11..0]
M_D[27..16]
O
Memory Address Bus[23..12]
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.
Address decode low. Copy of address MSB.
Address decode high. Compliment of address MSB.
NVRAM Write Enable.
ROM/NVRAM Output Enable.
For
M_D[30]
M_D[31]
NVM_WE_N
NVM_OE_N
O
O
O
O
Table 19. ROM/NVRAM Interface
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