AM79C985 datasheet(21/48 Pages) AMD

21 / 48 page

Am79C985

PRELIMINARY

Figure 5. Internal Arbitration—eIMR+ Devices in Cascade

Management Functions

The eIMR+ device receives management commands

in the form of byte-length data on the serial input pin,

SI. If the eIMR+ device is expected to provide data in

response to the command, it will send byte-length data

to the serial-output pin, SO. Both the input and output

data streams are clocked with the rising edge of the

SCLK signal. The byte-length data is in RS232 serial-

data format; that is, one start bit followed by eight data

bits. The externally generated clock at the SCLK pin

may 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, 20 SCLK

clock transitions are required for management com-

mands that produce SO data, and 14 SCLK clock tran-

sitions are required for management commands that

do not produce SO data.

VDD

Ω

SELI_0

SELI_1

SELO

SELI_0

SELI_1

SELO

SELI_0

SELI_1

SELO

SELI_0

SELI_1

SELO

SELI_0

SELI_1

SELO

SELI_0

SELI_1

SELO

SELI_0

SELI_1

SELO

20651B-10

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