SAA2502H 데이터 시트보기 (PDF) - Philips Electronics

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SAA2502H

ISO/MPEG Audio Source Decoder

Philips Electronics 

Philips Semiconductors

ISO/MPEG Audio Source Decoder

Preliminary specification

SAA2502

handbook, full pagewidth RESET

CMODE

CCLK

(1)

I2C-bus mode

L3 mode

(2)

,,,,,,,, (3)

MGE482

(1) The value of the CMODE signal while RESET is asserted defines the microcontroller interface mode; CMODE = logic 1 = I2C-bus,

CMODE = logic 0 = L3. No transfers can be performed (CCLK stays HIGH).

(2) L3 mode of operation only. For a correct initialization of the interface unit, it is mandatory to make CMODE HIGH and LOW again after RESET has

been de-asserted. This must occur before any L3 transfer (even to or from other devices) is performed. As shown CCLK should stay HIGH during

this step.

(3) Now the first transfer can be performed on the microcontroller bus.

Any deviation from these steps may result in undefined behaviour of the microcontroller interface, even with the possibility of disturbing transfers

to other devices connected to the control bus.

At a hard reset, all writeable data items are forced to their default values.

Fig.18 Microcontroller interface initialization procedure.

7.6.5 TRANSFER PROTOCOLS

7.6.5.1 L3 transfer protocol

The protocol enables writing of settings and reading of status and/or data. In this protocol, the host first issues a 6-bit

wide ‘device address’ on CDATA while CMODE = logic 0. All devices connected to the bus read this address. Then data

transfers to or from the host are carried out while CMODE = logic 1. All devices with a different device address must

neglect these data transfers until the next address is issued. Only the device with an address equal to the issued device

address performs the transfer.

Table 20 L3 device address.

BIT 7

0

BIT 6

1

BIT 5

1

BIT 4

0

BIT 3

0

BIT 2

0

BIT 1

DOM1(1)

BIT 0

DOM0(1)

Note

1. The ‘Data Operation Mode’ bits DOM1 and DOM0 define the current sub-mode of the control interface until the next

time a device address is issued (see Table 21).

Table 21 DOM1 and DOM0 bits

DOM1

0

0

1

1

DOM0

0

1

0

1

FUNCTION

data (new local register contents) sent to the SAA2502

data (current local register contents) sent to the microcontroller

local register address sent to the SAA2502

short (1 byte) SAA2502 status report sent to the microcontroller

1997 Nov 17

29

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