gm82c765b ETC-unknow, gm82c765b Datasheet - Page 8

• Manufacturer Part Number: gm82c765b
• Description: Floppy Disk Subsystem Controller
• Manufacturer: ETC-unknow

Note: CY specifies CLK1 or XT1 period
2.4 AC Timing Diagrams
(1) READ Timing
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
STD
IDX
MR
MW
MRW
CA
CAS
XCA
XTS
TCR
TCW
MCY specifies MCLK period, dependent on selected data rate
WCY specifies WCLK period, dependent on selected data rate
CS
RD
A0
DATA
IRQ
Chip Access Delay from RST Low-TTL
Chip Access Delay from
Chip Access Delay from RST-OSC XT1 at 16MHz
XT2 Access Delay after RST 9.6MHz
TC Delay from Last DMA or IRQ,
TC Delay from Last DMA or IRQ,
IDX
DIRC
RD
WR
RD
,
DACK
Delay from DMA
or
Delay from DMA
Index Pulse Width
Hold Time after
.
,
WR
Response from DMA High
t
AR
STEP
PARAMETER
t
SRST
t
RD
Low
RD
WR
t
RR
8
Data Valid
t
t
t
DF
RA
RI
MIN
1000
500
96
32
40
2
0
0
0
0
MAX
GM82C765B
192
384
uS
48
UNITS
MCY
MCY
nS
nS
MCY
MCY
MCY
uS
MCY
MCY