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SCANPSC110FSC Datasheet(PDF) 9 Page - Fairchild Semiconductor |
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SCANPSC110FSC Datasheet(HTML) 9 Page - Fairchild Semiconductor |
9 / 25 page 9 www.fairchildsemi.com Level 1 Protocol ADDRESSING MODES The SCANPSC110F Bridge supports “single” and “multi- ple” modes of addressing a SCANPSC110F. The “single” mode will select one SCANPSC110F and is called Direct Addressing. More than one SCANPSC110F device can be selected via the Broadcast and Multi-Cast Addressing modes. TABLE 4. SCANPSC110F Bridge Address Modes Note 2: Hex address ’7X’, ’BX’, or ’FX’ may be used instead of ’3X’. Note 3: Only the six (6) LSB’s of the address is compared to the S(0–5) inputs. The two (2) MSB's are “don't cares”. DIRECT ADDRESSING The SCANPSC110F enters the Wait-For-Address state when: 1. its TAP Controller enters the Test-Logic-Reset state, or 2. its instruction register is updated with the GOTOWAIT instruction (while either selected or unselected). Each SCANPSC110F within a scan network must be stati- cally configured with a unique address via its S(0–5) inputs. While the SCANPSC110F controller is in the Wait-For- Address state, data shifted into bits 5 through 0 of the instruction register is compared with the address present on the S(0–5)inputs in the Update-IR state. If the six (6) LSBs of the instruction register match the address on the S(0–5) inputs, (see Figure 6) the SCANPSC110F becomes selected, and is ready to receive Level 2 Protocol (i.e., fur- ther instructions). When the SCANPSC110F is selected, its device identification register is inserted into the active scan chain. All SCANPSC110Fs whose S(0–5) address does not match the instruction register address become unselected. They will remain unselected until either their TAP Controller enters the Test-Logic-Reset state, or their instruction regis- ter is updated with the GOTOWAIT instruction. FIGURE 6. Direct Addressing: Device Address Loaded into Instruction Register BROADCAST ADDRESSING The Broadcast Address allows a tester to simultaneously select all SCANPSC110Fs in a test network. This mode is useful in testing systems which contain multiple identical boards. To avoid bus contention between scan-path output drivers on different boards, each SCANPSC110F’s TDOB buffer is always 3-stated while in Broadcast mode. In this configuration, the on-chip Linear Feedback Shift Register (LFSR) can be used to accumulate a test result signature for each board that can be read back later by direct- addressing each board’s SCANPSC110F. MULTI-CAST ADDRESSING As a way to make the broadcast mechanism more selec- tive, the SCANPSC110F provides a “Multi-cast” addressing mode. A SCANPSC110F's multi-cast group register (MCGR) can be programmed to assign that SCANPSC110F to one of four (4) Multi-Cast groups. When SCANPSC110Fs in the Wait-For-Address state are updated with a Multi-Cast address, all SCANPSC110Fs whose MCGR matches the Multi-Cast group will become selected. As in Broadcast mode, TDOB is always 3-stated while in Multi-cast mode. Address Types Hex Address (Note 2) Binary Address (Note 3) TDOB State Direct Address 00 to 3A XX000000 to XX111010 Normal IEEE Std. 1149.1 Broadcast Address 3B XX111011 Always 3-STATED Multi-Cast Group 0 3C XX111100 Always 3-STATED Multi-Cast Group 1 3D XX111101 Always 3-STATED Multi-Cast Group 2 3E XX111110 Always 3-STATED Multi-Cast Group 3 3F XX111111 Always 3-STATED |
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