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SAA2032

Digital equalization for the tape drive processing of the DCC system

Philips Electronics 

Philips Semiconductors

Digital equalization for the tape

drive processing of the DCC system

Product specification

SAA2032

Mode Settings Load (LTCNT = 11) (See Fig.10)

The 8-bits transmitted under ’mode settings load’ control

both the ’operation mode’ and the ’data exchange type’.

Table 3 Mode settings; ’operation mode’.

a1

a0

OPERATION MODE

0

0

normal

0

1

test

1

0

search

1

1

off

Table 4 Mode settings; ’data exchange type’.

b1

b0

DATA EXCHANGE TYPE

0

0

write coefficient

data

0

1

read coefficient

data

1

1

read envelope

data

Remark post condition: after every communication

sequence the data exchange type must be set to “read

coefficient data”.

MSB

LSB

* * * * b1 b0 a1 a0

MCD480

data

operation

exchange mode

type

Address Information Load (LTCNT = 10) (See Fig.11)

A channel/tap combination can be selected through this

type of data exchange.

Co-efficient Data Load (LTCNT = 00) (See Fig.12)

This type of data exchange will overwrite the equalizer tap

coefficient of the current selected channel/tap

combination.

The coefficient data for tap <0000> of the auxiliary channel

should always be zero.

Data Read (LTCNT = 01) (See Fig.13)

This type of data exchange will send information from the

LTDATA register in the SAA2032 to the microcontroller.

Data in the LTDATA register depends upon the current

data exchange type.

LTDATA interpretation:

• coefficient data: two’s complement coefficient data

• tape speed data

– d7 = SVF flag

– d6 to d2 = SC4 to SC0

– d1, d0 = SR1, SR0.

Tape speed data format is shown in Fig.14.

Fig.10 Mode settings load (LTCNT = 11).

February 1995

12

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