MAC7200 datasheet(269/976 Pages) FREESCALE

269 / 976 page

IEEE 1149.1 State Machine and RD/WR Sequences

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

191

11.12.2 JTAG Sequence for Accessing Internal Nexus Registers

11.12.3 JTAG Sequence for Read Access of Memory-Mapped Resources

11.12.4 JTAG Sequence for Write Access of Memory-Mapped Resources

Table 11-46. JTAG Sequence for Accessing Internal Nexus Registers

Step #

TMS Pin

Description

IDLE

→ SELECT-DR_SCAN

SELECT-DR_SCAN

→ CAPTURE-DR (Nexus Command Register value loaded in shifter)

CAPTURE-DR

→ SHIFT-DR

(7) TCK clocks issued to shift in direction (rd/wr) bit and first 6 bits of Nexus reg. addr.

SHIFT-DR

→ EXIT1-DR (7th bit of Nexus reg. shifted in)

EXIT1-DR

→ UPDATE-DR (Nexus shifter is transferred to Nexus Command Register)

UPDATE-DR

→ SELECT-DR_SCAN

SELECT-DR_SCAN

→ CAPTURE-DR (Register value is transferred to Nexus shifter)

CAPTURE-DR

→ SHIFT-DR

(31) TCK clocks issued to transfer register value to TDO pin while shifting in TDI value

SHIFT-DR

→ EXIT1-DR (MSB of value is shifted in/out of shifter)

EXIT1-DR

→ UPDATE-DR (if access is write, shifter is transferred to register)

UPDATE-DR

→ RUN-TEST/IDLE (transfer complete, Nexus controller to Reg. Select state)

Table 11-47. JTAG Sequence for Read Access of Memory-Mapped Resources

Step #

TCLK clocks

Description

Nexus Command = write to Read/Write Access Address Register (RWA)

Write RWA (initialize starting read address, data input on TDI)

Nexus Command = write to Read/Write Control/Status Register (RWCS)

Write RWCS (initialize read access mode and CNT value, data input on TDI)

—

Wait for falling edge of RDY pin

Nexus Command = read Read/Write Access Data Register (RWD)

Read RWD (data output on TDO)

—

If CNT > 0, go back to Step #6

Table 11-48. JTAG Sequence for Write Access of Memory-Mapped Resources

Step #

TCLK clocks

Description

Nexus Command = write to Read/Write Address Register (RWA)

Write RWA (initialize starting write address, data input on TDI)

MAC7200 bảng dữ liệu(PDF) 269 Page - Freescale Semiconductor, Inc

MAC7200 bảng dữ liệu(HTML) 269 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL