80C88

FN2949 Rev.5.00

Page 21 of 39

Sep 28, 2017

FIGURE 10. BUS TIMING - MINIMUM MODE SYSTEM (Continued)

NOTES:

11. Two INTA cycles run back-to-back. The 80C88 local ADDR/DATA bus is floating during both INTA cycles. Control signals are shown for the second INTA

cycle.

12. Signals at 82C84A are shown for reference only.

T4

T3

T2

T1

TW

TCLDX1 (7)

TWHDX

TCVCTX

TCHCTV (30)

TCLAV

TCLAZ

TCHCTV

(31) TCVCTX

TCVCTV

(17)

(26)

(27)

(29) TCVCTV

DATA OUT

AD7-AD0

INVALID ADDRESS

CLK (82C84A OUTPUT)

WRITE CYCLE

AD7-AD0

DEN

WR

INTA CYCLE

(NOTE 11)

AD7-AD0

DT/R

INTA

DEN

AD7-AD0

SOFTWARE

HALT -

DEN, RD,

SOFTWARE HALT

(29) TCVCTV

POINTER

TCL2CL1

(5)

TW

TCLAV

TCLDV

TCLAX

(18)

TCLDX2

(29)

(28)

(29) TCVCTV

(19)

TCVCTX

(6)

(30)

(31)

(17)

TCH1CH2

(4)

ALE

IO/M

DT/R

SSO

TCLLH

(23)

TCHLL

(24)

TCVCTX

(31)

TCHCTV

(30)

TDVCL

(31)

TWLWH

(38)