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DSP56857 Datasheet(PDF) 472 Page - Freescale Semiconductor, Inc

Part # DSP56857
Description  Digitial Signal Controller
PDF  662 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 Datasheet(HTML) 472 Page - Freescale Semiconductor, Inc

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JTAG Port Architecture
5685X Digital Signal Controller User Manual, Rev. 4
17-10
Freescale Semiconductor
17.5.2.3 High Z Instruction (HIGHZ)
The HIGHZ instruction enables the single-bit bypass register between TDI and TDO. It is
provided as a public instruction in order to prevent having to drive the output signals back during
circuit board testing. When the HIGHZ instruction is invoked, all output drivers are placed in an
inactive-drive state. HIGHZ asserts internal system reset for the system logic for the duration of
HIGHZ in order to force a predictable internal state while performing external boundary scan
operations.
17.5.3 JTAG Chip Identification (CID) Register
The Chip Identification (CID) register is a 32-bit register providing a unique JTAG ID for the
DSP56853/54/55/57/58. It is offered as a public instruction to allow the manufacturer, part
number, and version of a component to be determined through the TAP. Figure 17-4 illustrates
the CID register configuration.
Figure 17-4. JTAG Chip Identification (CID) Register
The device identification number for the initial release of the 5685x family is $01F5A01D.
CIR = $2
15
14
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11
10
9
8
7
6
5
4
3
2
1
0
Read
PNUM
3
PNUM
2
PNUM
1
PNUM
0
MFG
ID 11
MFG
ID 10
MFG
ID 9
MFG
ID 8
MFG
ID 7
MFG
ID 6
MFG
ID 5
MFG
ID 4
MFG
ID 3
MFG
ID 2
MFG
ID 1
MFG
ID 0
Write
Reset
101000
0000011101
CIR = $2
31
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25
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22
21
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19
18
17
16
Read
VER
3
VER
2
VER
1
VER
0
PNUM
15
PNUM
14
PNUM
13
PNUM
12
PNUM
11
PNUM
10
PNUM
9
PNUM
8
PNUM
7
PNUM
6
PNUM
5
PNUM
4
Write
Reset
000000
0111110101



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