DSP56857 datasheet(473/662 Pages) FREESCALE

473 / 662 page

JTAG Boundary Scan Register (BSR)

JTAG Port, Rev. 4

Freescale Semiconductor

17-11

17.6 Bypass Register (BYPASS)

The JTAG bypass register is a one-bit register used to provide a simple, direct path from the TDI

pin to the TDO pin. This is useful in boundary scan applications where many chips are serially

connected in a daisy-chain. Individual DSCs, or other devices, can be programmed with the

BYPASS instruction so individually they become pass-through devices during testing. This

allows testing of a specific chip, while still having all of the chips connected through the JTAG

ports.

Figure 17-5. JTAG Bypass Register (JTAGBR)

17.7 JTAG Boundary Scan Register (BSR)

The JTAG Boundary Scan Register (BSR) is configured as described in Figure 17-6. This

instructions enabling the boundary scan registers between TDI and TDO. Boundary Scan

the first bit shifted out of TDO when loading and unloading the boundary scan chain. For the

most current BSDL files, please refer to www.freescale.com. Figure 17-6 illustrates the register,

while Table 17-5 provides the contents of the BSR for the 5685x.

Figure 17-6. Boundary Scan Register (BSR)

Table 17-4. Device ID Register Bit Assignment

Bit No.

Code Use

56853/854/855/857/858 Values

31–28

Version Number

0000 (For initial version only—these bits may vary)

27–22

Design Center ID

00 0111

21–12

Family and part ID

11 0101 1010

11-1

Manufacturer ID

000 0000 1110

IEEE Requirement

Always 1

IR = $0, $1, $3

337

336

335

334

333

Bits 332 through 5

4321

Read-Only

IR = $6, $7, $FF

Read/Write

Reset

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