PC87311AVF datasheet(71/78 Pages) NSC

部件名	PC87311AVF

功能描述	PC87311A/PC87312 (SuperI/OTM II/III) Floppy Disk Controller with Dual UARTs, Parallel Port, and IDE Interface

PDF	78 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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71 / 78 page

90 Device Description (Continued)

929 Reset Timing

Symbol

Parameter

Min

Max

Units

tRW

Reset Width (Note 1)

100

tRC

Reset to Control Inactive

300

Note 1

The software reset pulse width is 100 ns The hardware reset pulse width with an external 10 kX pull-up or pull-down resistor on the MFM pin is 100 ns

When using the internal pull-up resistor on the MFM pin the hardware reset pulse width is 170 ns (assumes no pF load)

TLF11362 – 27

Note 2

DRQ and IRQ6 will be TRI-STATE after time tRC when in the AT or Model 30 mode

FIGURE 9-9 Reset Timing

9210 Write Data Timing

Symbol

Parameter

Min

Max

Units

tHDH

HDSEL Hold from WGATE Inactive

750

tHDS

HDSEL Setup to WGATE Active

100

tWDW

Write Data Pulse Width

Table 9-2

TABLE 9-2 Minimum tWDW Values

Data Rate

tDRP

tWDW

tWDW Value

Units

1 Mbs

1000

2 c tICP

250

500 kbs

2000

2 c tICP

250

300 kbs

3333

2 c tICP

375

250 kbs

4000

2 c tICP

500

TLF11362 – 28

FIGURE 9-10 Write Data Timing

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