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

bit location in INTRFLG will clear the corresponding interrupt. If a masked interrupt occurs, the microcontroller can still

detect the occurrence because the event is still posted in INTRFLG.

Table 8 Interrupt mask register: 0xF0FB

MNEMONIC R/W

INTRMSK R/W

7

6

MASK7 MASK6

5

MASK5

DATA BYTE

4

MASK4

3

MASK3

2

MASK2

1

MASK1

0

MASK0

Each bit in register 0xF0FB corresponds to the interrupt at the same bit location in register 0xF0FC. To enable an

interrupt, the bit in this register must be set HIGH.

Table 9 Interrupt flag register: F0FC; note 1

MNEMONIC R/W

7

6

5

DATA BYTE

4

3

2

INTRFLG R/W CDB2INT FETXINT FERXINT ECC_COR FE_HDR FE2352

1

0

STR_LST FRM_STR

Note

1. If any bit is set in this register an interrupt is sent to the microcontroller. Table 10 shows when the interrupts are

asserted; assuming the corresponding mask bit is set.

Table 10 INTRFLG field descriptions

FIELD

FRM_STR

STR_LST

FE_2352

FE_HDR

ECC_COR

RFERXINT

FETXINT

CDB2INT

DESCRIPTION

set one when one complete frame is stored

set at the start of the last frame

set if the front-end data exceeds 2352 bytes

front-end interrupt for header (or Q channel) ready

ECC interrupt for correction complete

front-end interrupt for receive ready

front-end interrupt for transmit ready

CDB2 interrupts: see CSTAT (Table 78) for bit descriptions

8.4 Microcontroller RAM organization

MICFRM# is used to determine the frame address for the

microcontroller access through the frame window

0x8000 to 0x8FFF. To obtain the actual byte location

within the buffer RAM, the lower 12 bits of the

microcontroller address form the relative offset and hence

the absolute address is found.

Note that the microcontroller has the option of addressing

memory in a linear fashion using the 32 kbytes address

space between 0x000 and 0x7FFF. If this 32 kbytes page

is used, the PAGEREG must be programmed with the

required page address. PAGEREG is used to select the

required page when the microcontroller makes a linear

access to the buffer memory using the address space

0x7000 to 0x7FFF. The actual address is the fifteen LSBs

from the microcontroller plus 32768 times the value in

PAGEREG.

1996 Jul 02

21

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