參數(shù)資料
型號(hào)： DJLXT972MQEA4
廠商： Intel Corp.
英文描述： Single-Port 10/100 Mbps PHY Transceiver
中文描述： 單端口10/100 Mbps的物理層收發(fā)器
文件頁(yè)數(shù)： 55/92頁(yè)
文件大小： 666K
代理商： DJLXT972MQEA4
Intel
LXT972M Single-Port 10/100 Mbps PHY Transceiver
Datasheet
Document Number: 302875-005
Revision Date: 27-Oct-2005
55
5.10
Boundary Scan (JTAG 1149.1) Functions
The LXT972M Transceiver includes a IEEE 1149.1 boundary scan test port for board level testing.
All digital input, output, and input/output pins are accessible.
Note:
For the related BSDL file, contact your local sales office or access the Intel website
(www.intel.com)
.
5.10.1
Boundary Scan Interface
The boundary scan interface consists of five pins (TMS, TDI, TDO, TRST_L, and TCK). It
includes a state machine, data register array, and instruction register. The TMS and TDI pins are
pulled up internally. TCK is pulled down internally. TDO does not have an internal pull-up or pull-
down.
5.10.2
State Machine
The TAP controller is a state machine, with 16 states driven by the TCK and TMS pins. Upon reset,
the TEST_LOGIC_RESET state is entered. The state machine is also reset when TMS and TDI are
high for five TCK periods.
5.10.3
Instruction Register
After the state machine resets, the IDCODE instruction is always invoked. The decode logic
ensures the correct data flow to the Data registers according to the current instruction.
Table 16
lists valid JTAG instructions for the LXT972M Transceiver.
Table 16. Valid JTAG Instructions
Name
Code
Description
Mode
Data Register
EXTEST
1111 1111 1110 1000
External Test
Test
BSR
IDCODE
1111 1111 1111 1110
ID Code Inspection
Normal
ID REG
SAMPLE
1111 1111 1111 1000
Sample Boundary
Normal
BSR
HIGHZ
1111 1111 1100 1111
Force Float
Normal
Bypass
CLAMP
1111 1111 1110 1111
Control Boundary to 1/0
Test
Bypass
BYPASS
1111 1111 1111 1111
Bypass Scan
Normal
Bypass
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