am79c850 Advanced Micro Devices, am79c850 Datasheet - Page 37

• Manufacturer Part Number: am79c850
• Description: Supernet-r 3
• Manufacturer: Advanced Micro Devices

shifted out in the SHIFT_DR TAP controller state. The
BIST result register is 33 bits in length.
BYPASS Instruction
The BYPASS instruction is used to bypass the SUPER-
NET 3 BSR and shorten access times to other devices
on a board. This instruction selects the bypass register
for scanning between TDI and TDO during the Shift-DR
BSR Cell No.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
1
2
3
4
5
6
7
8
9
Pin No.
N/A
54
55
56
67
68
69
70
71
72
73
74
75
77
78
79
80
81
82
83
84
86
87
88
89
90
91
92
93
Pin Type
output
output
output
output
output
output
output
output
output
output
output
output
output
output
input
input
input
input
input
input
input
input
input
input
input
input
input
input
–
P R E L I M I N A R Y
SUPERNET 3
controller state. The SUPERNET 3 is not otherwise
affected by this instruction.
Boundary Scan Cells
In boundary scan most of the chip input and output
latches are linked together to form a scan chain. The
main purpose of this is for board level testing. The
boundary scan ring order is listed in the following table.
Description
scrm
encoff
ebferr
fotoff
ulsb
lsr[2]
lsr[1]
lsr[0]
rpar
r[0]
r[1]
r[2]
r[3]
r[4]
r[5]
r[6]
r[7]
rcl
rcu
flxi
oe control (1 to enable)
xpar
x[0]
x[1]
x[2]
x[3]
x[4]
x[5]
x[6]
AMD
37