80C88

FN2949 Rev.5.00

Page 24 of 39

Sep 28, 2017

Waveforms

FIGURE 11. BUS TIMING - MAXIMUM MODE (USING 82C88)

NOTES:

18. RDY is sampled near the end of T2, T3, and TW to determine if TW machine states are to be inserted.

19. Signals at 82C84A or 82C88 are shown for reference only.

20. Status inactive in state just before T4.

21. The issuance of the 82C88 command and control signals (MRDC, MWTC, AMWC, IORC, IOWC, AIOWC, INTA, and DEN) lags the active high 82C88 CEN.

T1

T2

T3

T4

TCLCL

TCH1CH2

TCL2CL1 TW

TCHCL (3)

(21) TCHSV

(SEE NOTE 20)

TCLDV

TCLAX

(23) TCLAV

TCLAV

A19-A16

TSVLH

TCLLH

TR1VCL

TCHLL

TCLR1X

TCLAV

TDVCL

TCLDX1

TCLAX

AD7-AD0

DATA IN

TRYHSH

(39) TCLRH

TRHAV

(41) TCHDTL

TCLRL

TRLRH

TCHDTH

(37) TAZRL

TCLML

TCLMH

(35) TCVNV

TCVNX

CLK

QS0, QS1

S2, S1, S0 (EXCEPT HALT)

A19/S6-A16/S3

ALE (82C88 OUTPUT)

RDY (82C84 INPUT)

NOTES 18, 19

READY 80C86 INPUT)

READ CYCLE

82C88

OUTPUTS

SEE NOTES 19, 21

MRDC OR IORC

DEN

S6-S3

AD7-AD0

RD

DT/R

TCLAV

(1)

(4)

(23)

TCLCH

(2)

TCLSH

(22)

(24)

(23)

(27)

(29)

(31)

(8)

(9)

TCHRYX

(11)

(20)

(12) TRYLCL

(24)

TRYHCH

(10)

(6)

(7)

(23)

(40)

(42)

(45)

(38)

(18)

(19)

(36)

(33)

TCLAZ

(25)

(5)

A15-A8

A15-A8