AD6620SSLASHPCB datasheet(33/44 Pages) AD

33 / 44 page

AD6620

–33–

REV. A

Mode = 0

If MODE is low during the access, the interface is in Mode 0.

In Mode 0 the

CS, RD and the WR lines control the access

type. While an access is being performed, or if the serial port

DATA VALID

tHC

tSC

tHC

tSC

tHM

ADDRESS VALID

N+1

N+2

N+3

CLK1

WR2

RD2

CS3

D[7:0]

RDY

A[2:0]

NOTES:

1 RDY IS DRIVEN LOW ASYNCHRONOUSLY BY WR AND CS GOING LOW AND RETURNS HIGH ON THE

2 THESE SIGNALS (R/W AND DS) MAY REMAIN IN LOW STATE TO CONTINUE WRITING DATA.

3 CS MUST RETURN TO HIGH STATE AND BE SAMPLED BY CLK (N+3 SHOWN) TO COMPLETE WRITE.

*THE NEXT WRITE MAY BE INITIATED ON CLK, N.

tHA

tRDYH

tRDYL

tSAM

RISING EDGE OF CLK "N+2".

Figure 44. Mode 0 Write (MODE = GND)

is accessing the chip, the RDY line goes low at the start of

the access. When the internal cycle is complete the RDY line

is released.

tDD

DATA VALID

tHC

tSC

tHC

tZD

tHA

tRDY

ADDRESS VALID

tSAM

tZR

N+1

N+2

N+3

N+4

CLK1

WR2

RD2

CS3

D[7:0]

RDY1

A[2:0]

NOTES:

1 RDY IS DRIVEN LOW ASYNCHRONOUSLY BY RD AND CS GOING LOW AND RETURNS HIGH ON THE RISING EDGE

OF CLK "N+3" FOR INTERNAL ACCESS (A[2:0] = 000), CLK "N+2" OTHERWISE.

2 THE SIGNAL, WR, MAY REMAIN HIGH AND RD MAY REMAIN LOW TO CONTINUE READ MODE.

3 CS MUST RETURN TO HIGH STATE AND BE SAMPLED BY CLK (N+4 SHOWN) TO COMPLETE READ.

Figure 43. Mode 0 Read (MODE = GND)

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