CS7808 datasheet(7/52 Pages) CIRRUS

7 / 52 page

CS7808

1.2

DC CHARACTERISTICS

(TA= 25°C; VDD_PLL=VDD_CORE=2.5V±10%, VDD_IO=3.3V±10%)

1.2.1

Host Interface

CS7808 can interface with a ATAPI-type slave loader gluelessly. Figure 1 illustrates a read ATAPI trans-

action and a write ATAPI transaction. PIO mode 4 is implemented to enable a sufficient data transfer rate

between ATAPI device and CS7808.

Symbol

Description

Min

Typ

Max

Unit

tacyc

Cycle Time1

1.Values are guaranteed by design only.

taavr

Address Valid to HMRD-/HMWR- Setup

tah

Address Hold from HMRD-/HMWR- Setup

tarww

H_RD-/H_WR- Pulse Width

tarec

H_RD-/H_WR- Recovery Time

tawsu

H_WR- Data Setup

tawh

H_WR- Data Hold

tardsu

H_RD- Data Setup

tarddh

H_RD- Data hold

tarddh

H_RD- Data High-Z

tarsu

H_RDY Setup Time

tarh

H_RDY Hold Time1

0ns

Table 1. Host Interface Characteristics

Figure 1. Host Timing Diagram

H_A[2:0] ,

H_CS[3:0]

H_D[15:0](WRITE)

H_D[15:0](READ)

H_RD/H_WR

tacyc

t aavr

t arww

t ah

tarec

tarsu

tawh

tawsu

tardsu

t arddh

tardts

t arh

H_RDY(deasserted

before tarsu)

H_RDY(asserted

before tarsu)

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