參數(shù)資料
型號(hào)： 21440
廠商： Intel Corp.
英文描述： Multiport 10/100Mb/s Ethernet Controller(多端口10/100Mb/s 以太網(wǎng)控制器)
中文描述： 多端口10/100Mb/s以太網(wǎng)控制器（多端口支持10/100Mbps以太網(wǎng)控制器）
文件頁(yè)數(shù)： 90/92頁(yè)
文件大?。?/td> 1352K
代理商： 21440
Joint Test Action Group – Test Logic
A-2
21440 Multiport 10/100Mb/s Ethernet Controller
A.2.1
Instruction Register
The 21440 JTAG test logic instruction register is a 3-bit scan-type register that is used to program
the JTAG machine to the appropriate operating mode. Its contents are interpreted as test
instructions.
Table A-1
lists the instructions register.
A.2.2
Bypass Register
The bypass register is a 1-bit shift register that provides a single-bit serial connection between the
tdi and tdo signals. This register is used when the instruction register is set to bypass mode or after
powerup.
A.2.3
Boundary-Scan Register
The boundary-scan register consists of cells located on all the pads. This register provides the
ability to perform board-level interconnection tests by shifting data inside through tdi and outside
through tdo. It also provides additional control and observation of the 21440 pins. For example, the
21440 boundary-scan register can observe the output enable control signals of the I/O pads.
Table A-1. Instructions Register
IR<2>
IR<1>
IR<0>
Description
0
0
0
EXTEST mode (mandatory instruction).
Test data is shifted into the 21440 boundary-scan register and
then transferred in parallel to the output pins.
0
0
1
Sample-preload mode (mandatory instruction).
Test data is loaded in parallel from the input pins into the 21440
boundary-scan register and then shifted out for examination.
0
1
0
RESERVED
0
1
1
RESERVED
1
0
0
RESERVED
1
0
1
Tristate mode (optional instruction).
Allows the 21440 to enter the power-saving mode. In this mode,
all the port pads are tristated.
1
1
0
Continuity mode (optional instruction).
Allows the 21440 continuity test. In this mode, all the port pads get
a
“
0
”
value.
1
1
1
Bypass mode (mandatory instruction).
Allows the test features on the 21440 test logic to be bypassed.
Bypass mode is selected automatically when power is applied.
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