FDC37C78-HT View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

FDC37C78-HT

Floppy Disk Controller

Microchip Technology 

t3

nDIR

nSTEP

t4

t1

t2

t5

nDS0-1

t6

nINDEX

t7

nRDATA

t8

nWDATA

nIOW

t9

t9

nDS0-1,

nMTR0-1

Parameter

t1 nDIR Set Up to nSTEP Low

t2 nSTEP Active Time Low

t3 nDIR Hold Time After nSTEP

t4 nSTEP Cycle Time

t5 nDS0-1 Hold Time from nSTEP Low

t6 nINDEX Pulse Width

t7 nRDATA Active Time Low

t8 nWDATA Write Data Width Low

t9 nDS0-1, MTR0-1 from End of nIOW

min

typ

max

units

4

X*

24

X*

96

X*

132

X*

20

X*

2

X*

40

ns

.5

Y*

25

ns

*X specifies one MCLK period and Y specifies one WCLK period.

MCLK = Controller Clock to FDC (See Table 6).

WCLK = 2 x Data Rate (See Table 6).

FIGURE 7 - DISK DRIVE TIMING

79

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