PC87310 datasheet(34/52 Pages) NSC

34 / 52 page

40 Functional Description (Continued)

TLC10591 – 35

Notes

FE e Data pattern of FE Clock pattern of C7

FC e Data pattern of FC Clock pattern of D7

FB e Data pattern of FB Clock pattern of C7

F8 e Data pattern of F8 Clock pattern of C7

A1 e Data pattern of A1 Clock pattern of 0A

C2 e Data pattern of C2 Clock pattern of 14

All byte counts in decimal

All byte values in hex

CRC uses standard polynomial x16 a x12 a x5 a 1

FIGURE 5 IBM and ISO Formats Supported by the Format Command

SCAN COMMANDS

The Scan Commands allow data read from the disk to be

compared against data sent from the mP on a byte-by-byte

basis There are three Scan Commands to choose from

Scan Equal

Disk Data e mP Data

Scan Less Than or Equal

Disk Data s mP Data

Scan Greater Than or Equal

Disk Data t mP Data

Each sector is interpreted with the most significant bytes

first If the Wildcard mode is enabled from the Mode com-

mand an FF(hex) from either the disk or the mP is used as a

don’t care byte that will always match equal If after each

sector is read the desired condition has not been met the

next sector is read The next sector is defined as the current

sector number plus the Sector Step Size specified The

Scan command will continue until the scan condition has

been met or the End of Track Sector Number has been

reached or if TC is asserted

If the SK bit is set sectors with deleted data marks are

ignored If all sectors read are skipped the command will

terminate with D3 of ST2 set (Scan Equal Hit) The result

phase of the command is shown in Table 4-18

TABLE 4-18 Scan Command Termination Values

Status

Command

Conditions

Scan Equal

Disk e mP

Disk i mP

Scan Low

Disk e mP

or Equal

Disk k mP

Disk l mP

Scan High

Disk e mP

or Equal

Disk l mP

Disk k mP

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