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| 型號(hào)： | OR4E4 |
| 廠商： | Lineage Power |
| 英文描述： | Field-Programmable Gate Arrays(現(xiàn)場(chǎng)可編程門陣列) |
| 中文描述： | 現(xiàn)場(chǎng)可編程門陣列（現(xiàn)場(chǎng)可編程門陣列） |
| 文件頁(yè)數(shù)： | 44/132頁(yè) |
| 文件大小： | 2667K |
| 代理商： | OR4E4 |
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44
Lucent Technologies Inc.
Preliminary Data Sheet
August 2000
ORCA Series 4 FPGAs
Special Function Blocks
(continued)
The TAPC generates control signals that allow capture, shift, and update operations on the instruction and data
registers. In the capture operation, data is loaded into the register. In the shift operation, the captured data is
shifted out while new data is shifted in. In the update operation, either the instruction register is loaded for instruc-
tion decode, or the boundary-scan register is updated for control of outputs.
The test host generates a test by providing input into the ORCA Series TMS input synchronous with TCK. This
sequences the TAPC through states in order to perform the desired function on the instruction register or a data
register. Figure 28 provides a diagram of the state transitions for the TAPC. The next state is determined by the
TMS input value.
5-5370(F)
Figure 28. TAP Controller State Transition Diagram
SELECT-
DR-SCAN
CAPTURE-DR
SHIFT-DR
EXIT1-DR
PAUSE-DR
EXIT2-DR
UPDATE-DR
1
1
1
0
0
0
RUN-TEST/
IDLE
1
TEST-LOGIC-
RESET
SELECT-
IR-SCAN
CAPTURE-IR
SHIFT-IR
EXIT1-IR
PAUSE-IR
EXIT2-IR
UPDATE-IR
1
1
1
0
0
0
0
0
0
1
0
1
1
1
0
1
1
0
0
0
0
1
1
1
0
Boundary-Scan Cells
Figure 29 is a diagram of the boundary-scan cell (BSC)
in the ORCA series PIOs. There are four BSCs in each
PIO: one for each pad, except as noted above. The
BSCs are connected serially to form the BSR. The
BSC controls the functionality of the in, out, and 3-state
signals for each pad.
The BSC allows the I/O to function in either the normal
or test mode. Normal mode is defined as when an out-
put buffer receives input from the PLC array and pro-
vides output at the pad or when an input buffer
provides input from the pad to the PLC array. In the test
mode, the BSC executes a boundary-scan operation,
such as shifting in scan data from an upstream BSC in
the BSR, providing test stimuli to the pad, capturing
test data at the pad, etc.
The primary functions of the BSC are shifting scan data
serially in the BSR and observing input (p_in), output
(p_out), and 3-state (p_ts) signals at the pads. The
BSC consists of two circuits: the bidirectional data cell
is used to access the input and output data, and the
direction control cell is used to access the 3-state
value. Both cells consist of a FF used to shift scan data
which feeds a FF to control the I/O buffer. The bidirec-
tional data cell is connected serially to the direction
control cell to form a boundary-scan shift register.
The TAPC signals (capture, update, shiftn, treset, and
TCK) and the MODE signal control the operation of the
BSC. The bidirectional data cell is also controlled by
the high out/low in (HOLI) signal generated by the
direction control cell. When HOLI is low, the bidirec-
tional data cell receives input buffer data into the BSC.
When HOLI is high, the BSC is loaded with functional
data from the PLC.
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