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SN74ABT8952DWRE4 Scheda tecnica(PDF) 2 Page - Texas Instruments |
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SN74ABT8952DWRE4 Scheda tecnica(HTML) 2 Page - Texas Instruments |
2 / 29 page SN54ABT8952, SN74ABT8952 SCAN TEST DEVICES WITH OCTAL REGISTERED BUS TRANSCEIVERS SCBS121D – AUGUST 1992 – REVISED JULY 1996 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) Data flow in each direction is controlled by clock (CLKAB and CLKBA), clock-enable (CLKENAB and CLKENBA), and output-enable (OEAB and OEBA) inputs. For A-to-B data flow, A-bus data is stored in the associated registers on the low-to-high transition of CLKAB, provided that CLKENAB is low. Otherwise, if CLKENAB is high or CLKAB remains at a static low or high level, the register contents are not changed. When OEAB is low, the B outputs are active. When OEAB is high, the B outputs are in the high-impedance state. Control for B-to-A data flow is similar to that for A-to-B, but uses CLKBA, CLKENBA, and OEBA. In the test mode, the normal operation of the SCOPE ™ registered bus transceivers is inhibited, and the test circuitry is enabled to observe and control the I/O boundary of the device. When enabled, the test circuitry performs boundary-scan test operations as described in IEEE Standard 1149.1-1990. Four dedicated test pins control the operation of the test circuitry: test data input (TDI), test data output (TDO), test mode select (TMS), and test clock (TCK). Additionally, the test circuitry performs other testing functions such as parallel signature analysis (PSA) on data inputs and pseudo-random pattern generation (PRPG) from data outputs. All testing and scan operations are synchronized to the TAP interface. The SN54ABT8952 is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74ABT8952 is characterized for operation from –40 °C to 85°C. FUNCTION TABLE† (normal mode, each register) INPUTS OUTPUT OEAB CLKENAB CLKAB A B L L ↑ L L L L ↑ HH L HX X B0 L XL X B0 H X X X Z † A-to-B data flow is shown; B-to-A data flow is similar but uses OEBA, CLKENBA, and CLKBA. |
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