EP80579 Datasheet, PDF (1718/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
45.2.1.1.2
Sample/Preload
The Sample/Preload instruction is used to allow scanning of the boundary scan register
without causing interference to the normal operation of the device. Two functions can
be performed by use of the Sample/Preload instruction.
Sample - allows a snapshot of the data flowing into and out of the device to be taken
without affecting the normal operation of the device.
Preload - allows an initial pattern to be placed into the boundary scan register cells.
This allows initial known data to be present prior to the selection of another boundary
scan test operation.
45.2.1.1.3
IDCode
This instruction is used to determine the manufacturer, part number, and revision level
of the device being accessed. This instruction selects only the device identification
register to be connected for serial access between TDI and TDO in the Shift-DR
controller state. When this instruction is selected, the operation of the test logic shall
have no effect on the operation of the on-chip system logic. Reading the IDCode
returns a single value.
The ID consists of 6 fields. The first field is for the version and stepping of the device.
The Part Number field contains 3 fields. Field #1 is the product category, and for a
server, has a value of “000 100” binary. Field #2 is product type and is “01 000” for the
IMCH. Field #3 is an assigned chronological value within a product type. The
Manufacturer ID is “000 0000 1001” for Intel as assigned by IEEE. The last field is filled
by a binary “1”.
Table 45-2. JTAG Device Identification Register Field Designations
Version/
Stepping
Part Number
Manufacturer ID
4 bits
Field #1
6 bits
Field #2
5 bits
Field #3
5 bits
11 bits
Hardwired
‘1’
1 bit
The JTAG 32-bit ID contains information in order to uniquely identify a component, and
its manufacturer. Note that this ID does not uniquely distinguish between devices of a
given component type. This ID does not contain a device serial number. The fields as
defined are shown in the table below.
The revision codes must be changed to match chip specification.
45.2.1.1.4
HighZ
The HIGHZ instruction is used to force all outputs of the device (except TDO) into a
high impedance state. This instruction shall select the Bypass Register to be connected
between TDI and TDO in the Shift-DR controller state.
45.2.1.1.5
Bypass
The BYPASS command selects the Bypass Register to be connected for serial access
between TDI and TDO pins of the device. The Bypass Register is a single bit register
and is used to provide a minimum-length serial path through the device. This allows
more rapid movement of test data to and from other components in the system.
Intel^® EP80579 Integrated Processor Product Line Datasheet
1718
August 2009
Order Number: 320066-003US