21150-AB

Manufacturer Part Number21150-AB
DescriptionCommunications, Transparent PCI-to-PCI Bridge
ManufacturerIntel Corporation
21150-AB datasheet
 

Specifications of 21150-AB

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Page 145/164:

Boundary-Scan Register Cells

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16.6.1

Boundary-Scan Register Cells

Each boundary-scan cell operates in conjunction with the current instruction and the current state
in the test access port controller state machine. The function of the BSR cells is determined by the
associated pins, as follows:
Input-only pins—The boundary-scan cell is basically a 1-bit shift register. The cell supports
sample and shift functions.
Output-only pins—The boundary-scan cell comprises a 1-bit shift register and an output
multiplexer. The cell supports the sample, shift, and drive output functions.
Bidirectional pins—The boundary-scan cell is identical to the output-only pin cell, but it
captures test data from the incoming data line. The cell supports sample, shift, drive output,
and hold output functions. It is used at all I/O pins.
16.6.2
21150 Boundary-Scan Order
Table 38
lists the boundary-scan register order and the group disable controls. The group disable
control either enables or tristates its corresponding group of bidirectional drivers. When the value
of a group disable control bit is 0, the output driver is enabled. When the value is 1, the driver is
tristated. There are nine groups of bidirectional drivers, and therefore nine group disable control
bits.
The Group Disable Number column in
corresponding output driver. Group disable bits do not affect input-only pins, so those pins have a
blank rather than a group number in the Group Disable Number column. The group disable control
wire can control pins on either side of where the group disable boundary-scan register is placed.
The group disable boundary-scan registers have a boundary-scan register number entry, but they do
not have a corresponding pin number or signal name.
Data shifts from tdi into the most significant bit of the boundary-scan register, and from the least
significant bit of the boundary-scan register out to tdo.
Table 38. Boundary-Scan Order (Sheet 1 of 5)
Pin
Signal Name
Number
2
s_req_l<1>
3
s_req_l<2>
4
s_req_l<3>
5
s_req_l<4>
6
s_req_l<5>
7
s_req_l<6>
8
s_req_l<7>
9
s_req_l<8>
10
s_gnt_l<0>
11
s_gnt_l<1>
13
s_gnt_l<2>
14
s_gnt_l<3>
Preliminary
Datasheet
Table 38
shows which group disable bit controls the
Boundary-Scan
Group Disable
Register Number
Number
50
51
52
53
54
55
56
57
58
5
59
5
60
61
5
62
5
21150
Group Disable Cell
5
137