CS7808 datasheet(47/52 Pages) CIRRUS

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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.

Signal Name

Type

Description

111, 115, 101,

106

H_CS[3..0]

Host Chip Select[3..0]. The host master can be pro-

grammed to use a different protocol for each of the 4 chip

selects

H_ALE

Host address latch enable. Used for modes which multiplex

upper address information onto the data lines

H_RD

Host Read Request.

H_WR

Host Write Request.

H_RDY

Host Ready. Connect to pull-up or pull-down if host is not

used.

120

H_CKO

Host clock out, required for some synchronous slaves

102, 107, 97, 99,

100

H_A[4..0]

Host Address[4..0].

109, 110, 112,

113, 114, 116,

117, 118, 121,

122, 123, 125,

127, 130, 132,

134

H_D[15..0]

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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