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CS7808-CM Datasheet(PDF) 47 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) 47 Page - Cirrus Logic

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47
CS7808
6.9
Host Master/ATAPI Interface
This 16-bit parallel host interface allows the CS7808 to be a host master, controlling other devices that
would be used on the same system. See Table 24. The interface supports programmable protocols and
speeds, including multiplexed and non-multiplexed addressing. Slaves with different protocols can be con-
nected at the same time, controlled by different chip selects.
Pin
Signal Name
Type
Description
111, 115, 101,
106
H_CS[3..0]
O
Host Chip Select[3..0]. The host master can be pro-
grammed to use a different protocol for each of the 4 chip
selects
85
H_ALE
O
Host address latch enable. Used for modes which multiplex
upper address information onto the data lines
92
H_RD
O
Host Read Request.
93
H_WR
O
Host Write Request.
95
H_RDY
I
Host Ready. Connect to pull-up or pull-down if host is not
used.
120
H_CKO
O
Host clock out, required for some synchronous slaves
102, 107, 97, 99,
100
H_A[4..0]
O
Host Address[4..0].
109, 110, 112,
113, 114, 116,
117, 118, 121,
122, 123, 125,
127, 130, 132,
134
H_D[15..0]
B
Host Data Bus[15..0]. These pins can also output Host
Address during the address phase for multiplexed
address/data mode. Tie together to pull-up or pull-down if
host is not used.
Table 24. Host Master/ATAPI Interface


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