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KM736FV4021H-7 데이터시트(PDF) 9 Page - Samsung semiconductor |
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KM736FV4021H-7 데이터시트(HTML) 9 Page - Samsung semiconductor |
9 / 12 page Rev 1.0 KM718FV4021 128Kx36 & 256Kx18 SRAM - 9 - KM736FV4021 Dec. 1998 JTAG Instruction Coding NOTE : 1. Places DQs in Hi-Z in order to sample all input data regardless of other SRAM inputs. 2. TDI is sampled as an input to the first ID register to allow for the serial shift of the external TDI data. 3. Bypass register is initiated to VSS when BYPASS instruction is invoked. The Bypass Register also holds serially loaded TDI when exiting the Shift DR states. 4. SAMPLE instruction dose not places DQs in Hi-Z. IR2 IR1 IR0 Instruction TDO Output Notes 0 0 0 SAMPLE-Z Boundary Scan Register 1 0 0 1 IDCODE Identification Register 2 0 1 0 SAMPLE-Z Boundary Scan Register 1 0 1 1 BYPASS Bypass Register 3 1 0 0 SAMPLE Boundary Scan Register 4 1 0 1 BYPASS Bypass Register 3 1 1 0 BYPASS Bypass Register 3 1 1 1 BYPASS Bypass Register 3 IEEE 1149.1 TEST ACCESS PORT AND BOUNDARY SCAN-JTAG This part contains an IEEE standard 1149.1 Compatible Teat Access Port(TAP). The package pads are monitored by the Serial Scan circuitry when in test mode. This is to support connectivity testing during manufacturing and system diagnostics. Internal data is not driven out of the SRAM under JTAG control. In conformance with IEEE 1149.1, the SRAM contains a TAP controller, Instruction Reg- ister, Bypass Register and ID register. The TAP controller has a standard 16-state machine that resets internally upon power-up, therefore, TRST signal is not required. It is possible to use this device without utilizing the TAP. To disable the TAP controller without interfacing with normal operation of the SRAM, TCK must be tied to VSS to preclude mid level input. TMS and TDI are designed so an undriven input will produce a response identical to the application of a logic 1, and may be left unconnected. But they may also be tied to VDD through a resistor. TDO should be left unconnected. JTAG Block Diagram SRAM CORE BYPASS Reg. Identification Reg. Instruction Reg. Control Signals TAP Controller TDO M2 M1 TDI TMS TCK TAP Controller State Diagram Test Logic Reset Run Test Idle 0 1 1 1 1 0 0 0 1 0 1 1 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 Select DR Capture DR Shift DR Exit1 DR Pause DR Exit2 DR Update DR Select IR Capture IR Shift IR Exit1 IR Pause IR Exit2 IR Update IR 1 1 1 1 1 |
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