參數(shù)資料
型號(hào): 74LVTH182512DGGRE4
廠(chǎng)商: TEXAS INSTRUMENTS INC
元件分類(lèi): 總線(xiàn)收發(fā)器
英文描述: LVT SERIES, DUAL 9-BIT BOUNDARY SCAN REG TRANSCEIVER, TRUE OUTPUT, PDSO64
封裝: GREEN, PLASTIC, TSSOP-64
文件頁(yè)數(shù): 14/38頁(yè)
文件大?。?/td> 735K
代理商: 74LVTH182512DGGRE4
SN54LVTH18512, SN54LVTH182512, SN74LVTH18512, SN74LVTH182512
3.3-V ABT SCAN TEST DEVICES
WITH 18-BIT UNIVERSAL BUS TRANSCEIVERS
SCBS671B – AUGUST 1996 – REVISED OCTOBER 1997
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
simultaneous PSA and binary count up (PSA/COUNT)
Data appearing at the selected device input-mode I/O pins is compressed into an 18-bit parallel signature in
the shift-register elements of the selected input-mode BSCs on each rising edge of TCK. At the same time, an
18-bit binary count-up pattern is generated in the shift-register elements of the selected output-mode BSCs on
each rising edge of TCK, updated in the shadow latches, and applied to the associated device I/O pins on each
falling edge of TCK. Figures 11 and 12 show the 18-bit linear-feedback shift-register algorithms through which
the signature is generated. An initial seed value should be scanned into the BSR before performing
this operation.
1B8-I/O
1B7-I/O
1B6-I/O
1B5-I/O
1B4-I/O
1B3-I/O
1B2-I/O
1B1-I/O
1B9-I/O
1A7-I/O
1A6-I/O
1A5-I/O
1A4-I/O
1A3-I/O
1A2-I/O
1A1-I/O
1A8-I/O
1A9-I/O
2A7-I/O
2A6-I/O
2A5-I/O
2A4-I/O
2A3-I/O
2A2-I/O
2A1-I/O
2A8-I/O
2A9-I/O
2B8-I/O
2B7-I/O
2B6-I/O
2B5-I/O
2B4-I/O
2B3-I/O
2B2-I/O
2B1-I/O
2B9-I/O
MSB
LSB
=
Figure 11. 18-Bit PSA/COUNT Configuration (1OEAB = 2OEAB = 0, 1OEBA = 2OEBA = 1)
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