AM79C981 datasheet(14/40 Pages) AMD

14 / 40 page

AMD

PRELIMINARY

1–84

Am79C981

Management Port

The IMR+ device management functions are enabled

when the TEST pin is tied LOW. The management com-

mands are byte oriented data and are input serially on

the SI pin. Any responses generated during execution of

a management command are output serially in a byte-

oriented format by the IMR+ device on the SO pin. Both

the input and output data streams are clocked with the

rising edge of the SCLK pin. The serial command data

stream and any associated results data stream are

structured in a manner similar to the RS232 serial data

format, i.e., one Start Bit followed by eight Data Bits.

The externally generated clock at the SCLK pin can be

either a free running clock synchronized to the input bit

patterns or a series of individual transitions meeting the

setup and hold times with respect to the input bit pattern.

If the latter method is used, it is to be noted that 20 SCLK

clock transitions are required for proper execution of

management commands that produce SO data, and

that 14 SCLK clock transitions are needed to execute

management commands that do not produce SO data.

Management Commands

The following section details the operation of each man-

agement command available in the IMR+ chip. In all

cases, the individual bits in each command byte are

shown with the MSB on the left and the LSB on the right.

Data bytes are received and transmitted LSB first and

MSB last. See Table 2 for a summary of the manage-

ment commands.

SCLK

STRT D0

D1 D2 D3 D4 D5 D6

Command Execution Phase

Results Phase

STRT D0

D1 D2 D3 D4 D5 D6

Next Command

17306B-17

Management Command/Response Timing

SCLK

Command Execution Phase

Next Command Execution Phase

STRT D0

D1 D2 D3 D4 D5 D6

STRT D0

D1 D2 D3 D4 D5 D6

17306B-18

Management Command Timing with No Response

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