SAA7390 Просмотр технического описания (PDF) - Philips Electronics

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SAA7390

High performance Compact Disc-Recordable (CD-R) controller

Philips Electronics 

Philips Semiconductors

High performance Compact

Disc-Recordable (CD-R) controller

Preliminary specification

SAA7390

COMMAND

DESCRIPTION

CRC_RECALCULATE

CALCULATE_SYNDROME

S

COPY_RESULTS

Calculate CRC remainder buffer data, storing result in ECC RAM and updating

microprocessor status bit CRC_EQ0. Mode 2, Form 1 uses address 16 : 2075, or

0 : 2067; note 1

Prepares buffer for correction, calculates P and Q syndromes, and copies error flags

and CRC remainder from buffer to ECC RAM. The microprocessor status bits

PS_EQ0, QS_EQ0 and FLAGS_EQ0 are updated at the end of this operation.

1. Copy header from buffer to ECC RAM (Mode 2, Form 1 only)

2. Write to the buffer.

Not Mode 2, Form 1:

Address 0 → 0x00; Address 1 : 10 → 0xFF; Address 11 → 0x00;

Address 2068 : 2075 → 0x00

Mode 2, Form 1:

Address 0 → 0x00; Address 1 : 10 → 0xFF; Address 11 : 15 → 0x00

3. Read header and frame data from buffer to calculate P and Q syndromes

psyn[0 : 85].s1, psyn[0 : 85].s0, qsyn[0 : 51].s1 and qsyn[0 : 51].s0, storing results

in ECC RAM

4. Copy error flags from buffer to ECC RAM

5. Copy CRC remainder from buffer to ECC RAM

6. Update microprocessor status bits PS_EQ0, QS_EQ0 and FLAGS_EQ0.

Copies current ECC RAM contents to the buffer memory:

1. Copy header flags from ECC RAM to buffer (Mode 2, Form 1 only)

2. Copy error Flags from ECC RAM to buffer

3. Copy CRC remainder from ECC RAM to buffer

4. Copy P syndromes from ECC RAM to buffer

5. Copy Q syndromes from ECC RAM to buffer.

CORRECT_P_SYNDROME Scan all P syndromes and perform P-syndrome calculation. The microprocessor status

S

bits PS_EQ0, QS_EQ0 and FLAGS_EQ0 are updated at the end of this operation.

CORRECT_Q_SYNDROME Scan all Q syndromes and perform Q-syndrome calculation. The microprocessor

S

status bits PS_EQ0, QS_EQ0 and FLAGS_EQ0 are updated at the end of this

operation.

TEST_ECC_ROM

Read each exponent and log in the alpha ROM to the NUM_COR register. This

command may only be terminated by the ASSERT_ABORT command.

TEST_ECC_RAM_READ Read ECC RAM addresses 0 : 591 and copy to buffer addresses 0 : 591.

TEST_ECC_RAM_WRITE Read buffer addresses 0 : 591 and copy to ECC RAM addresses 0 : 591.

Note

1. 16 : 2075 and 0 : 2067 are address frame offsets. The frame buffer organization is shown in Table 76.

1996 Jul 02

19

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