Testability
R
222
Intel
®
82925X/82925XE MCH Datasheet
13.2
XOR Test Mode Initialization
XOR test mode can be entered by pulling reserved ballout RSV (located at F15) and MTYPE low
through the de-assertion of external reset (RSTIN#). It is recommended that customers use the
following sequence.
After power up, hold PWROK, PCIRST#, and reserved ballout RSV (located at F15) and
MTYPE low and start external clocks. After 20 cycles, pull PWROK high. After 15 clocks, de-
assert PCIRST# (pull it high). Release reserved ballout RSV (located at F15) and MTYPE. No
external drive. Allow the clocks to run for an additional 32 clocks. Begin testing the XOR chains.
13.3 XOR
Chain
Definition
The 82925X/82925XE MCH has 10 XOR chains. The XOR chain outputs are driven out on the
following output pins. During full-width testing, XOR chain outputs will be visible on both pins.
For example xor_out0 will be visible on BSEL2.
Table 13-2. XOR Chain Outputs
XOR Chain
Output Pins
Coordinate Location
xor_out0 BSEL2
D17
xor_out1 RSV
M16
xor_out2 RSV
F15
xor_out3 MTYPE
C15
xor_out4 RSV
A16
xor_out5 RSV
B15
xor_out6 RSV
C14
xor_out7 RSV
K15
xor_out8 BSEL1
E15
xor_out9 BSEL0
H16
13.4 XOR
Chains
The following tables show the XOR chains. The last section in this chapter has a pin exclusion
list. The chain files are golden, if there is a pin missing from the chain files and exclusion list, it
should be added to the exclusion list.
Summary of Contents for 82925X
Page 78: ...Host Bridge DRAM Controller Registers D0 F0 R 78 Intel 82925X 82925XE MCH Datasheet...
Page 98: ...EPBAR Registers Egress Port Register Summary R 98 Intel 82925X 82925XE MCH Datasheet...
Page 108: ...DMIBAR Registers Direct Media Interface DMI RCRB R 108 Intel 82925X 82925XE MCH Datasheet...
Page 156: ...Host PCI Express Graphics Bridge Registers D1 F0 R 156 Intel 82925X 82925XE MCH Datasheet...
Page 172: ...System Address Map R 172 Intel 82925X 82925XE MCH Datasheet...
Page 192: ...Electrical Characteristics R 192 Intel 82925X 82925XE MCH Datasheet...