参数资料
型号: CS7808
厂商: Cirrus Logic, Inc.
英文描述: MULTI PURPOSE AUDIO/VIDEO EMBEDDED PROCESSOR
中文描述: 多用途音频/视频嵌入式处理器
文件页数: 41/52页
文件大小: 985K
代理商: CS7808
41
CS7808
6.3
These pins are used to interface the CS7808 with some external SDRAM. The CS7808 can interface with
SDRAM of various sizes. Both 16 and 32-bit data width is supported, but best performance is achieved
with 32 bits. Follow the instructions in
Table 18
on how to interface with any particular configuration of
SDRAM.
SDRAM Interface
Pin
Signal Name
M_D[31..0]
Type
B
Description
87, 83, 79, 76,
74, 71, 68, 64,
67, 70, 72, 75,
78,80,86,88,
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
19
22
21
23
24
25
27
32, 31, 29, 28
Memory Data Bus. CS7808 can use all 32 bits or can use only
M_D[15..0], in which case M_D[31..16] can be left un-con-
nected.
M_A[11..0]
O
Memory Address Bus. Connect in order starting with M_A[0] to
all RAM address pins not already connected to M_BS_L or
M_AP. Unused upper M_A pins unconnected.
Memory Clock
Memory Clock Enable
Bank Selection. Always connect to RAM BS or BS0 pin.
Memory Auto Pre-charge. Always connect to RAM AP pin.
Memory Row Address Strobe
Memory Column Address Strobe
Memory Write Enable
IO Mask of Data Bus M_DQM[3] -> M_D[31:24]
M_CKO
M_CKE
M_BS_N
M_AP
M_RAS_N
M_CAS_N
M_WE_N
M_DQM[3..0]
O
O
O
O
O
O
O
O
Table 18. SDRAM Interface
相关PDF资料
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