GM82C765B Datasheet, PDF (8/36 Pages) Hynix Semiconductor – FLOPPY DISK SUBSYSTEM CONTROLLER

SYMBOL
PARAMETER
t _IDX
IDX Index Pulse Width
t _STD
DIRC Hold Time after STEP
t _MR
RD Delay from DMA
t _MW
WR Delay from DMA
t _MRW
RD or WR Response from DMA High
t _CA
Chip Access Delay from RST Low-TTL
t _CAS
Chip Access Delay from ^t SRST Low
t _XCA
Chip Access Delay from RST-OSC XT1 at 16MHz
t _XTS
XT2 Access Delay after RST 9.6MHz
t _TCR
TC Delay from Last DMA or IRQ, RD
t _TCW
TC Delay from Last DMA or IRQ, WR
Note: CY specifies CLK1 or XT1 period
MCY specifies MCLK period, dependent on selected data rate
WCY specifies WCLK period, dependent on selected data rate
2.4 AC Timing Diagrams
(1) READ Timing
CS, DACK. ,
A0
RD
DATA
t _AR
t _RR
t _RD
Data Valid
IRQ
GM82C765B
MIN
2
96
0
0
32
40
500
1000
0
0
MAX UNITS
MCY
MCY
nS
nS
48 MCY
MCY
MCY
uS
uS
192 MCY
384 MCY
t _RA
t _DF
t _RI
8