參數(shù)資料
型號(hào)： DS21FT42
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù)： 27/145頁
文件大?。?/td> 466K
代理商： DS21FT42
DALLAS SEMICONDUCTOR
DS21FF42/DS21FT42
101899
/1237
Signal Description:
Signal Type:
Set high to 3–state all output and I/O pins (including the parallel control port) when FMS =
1 or when FMS = 0 and JTRST* is tied low. Set low for normal operation. Ignored when
FMS = 0 and JTRST* = 1. Useful in board level testing.
FMS is tied to ground for the
DS21FF42/DS21FT42.
3–State Control
Input
Signal Name:
Signal Description:
Signal Type:
This signal is used to asynchronously reset the test access port controller. At power up,
JTRST* must be set low and then high. This action will set the device into the DEVICE
ID mode allowing normal device operation. If boundary scan is not used and FMS = 0, this
pin should be held low. This function is available when FMS = 0. When FMS=1, this pin
is held LOW internally. This pin is pulled up internally by a 10K ohm resistor.
FMS is
tied to ground for the DS21FF42/DS21FT42.
JTRST*
IEEE 1149.1 Test Reset
Input
Signal Name:
Signal Description:
Signal Type:
This pin is sampled on the rising edge of JTCLK and is used to place the test port into the
various defined IEEE 1149.1 states. This pin is pulled up internally by a 10K ohm resistor.
If not used, this pin should be left unconnected. This function is available when FMS = 0.
FMS is tied to ground for the DS21FF42/DS21FT42.
JTMS
IEEE 1149.1 Test Mode Select
Input
Signal Name:
Signal Description:
Signal Type:
This signal is used to shift data into JTDI pin on the rising edge and out of JTDO pin on
the falling edge. If not used, this pin should be connected to VSS. This function is available
when FMS = 0.
FMS is tied to ground for the DS21FF42/DS21FT42.
JTCLK
IEEE 1149.1 Test Clock Signal
Input
Signal Name:
Signal Description:
Signal Type:
Test instructions and data are clocked into this pin on the rising edge of JTCLK. This pin
is pulled up internally by a 10K ohm resistor. If not used, this pin should be left
unconnected. This function is available when FMS = 0.
FMS is tied to ground for the
DS21FF42/DS21FT42.
JTDI
IEEE 1149.1 Test Data Input
Input
Signal Name:
Signal Description:
Signal Type:
JTDO
IEEE 1149.1 Test Data Output
Output
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