82815 GMCH
R
172
Datasheet
Table 32 XOR Chain 8
31 Inputs
Output: SMAA4 (B12)
Pin Name
Ball
Voltage
Pin Name
Ball
Voltage
Pin Name
Ball
Voltage
ST1
AC24
Vddq
G_AD30
W26
Vddq
G_AD23
U21
Vddq
G_REQ#
AE26
Vddq
AD_STB1#
V23
Vddq
G_AD12
M21
Vddq
WBF#
AB24
Vddq
G_AD24
V25
Vddq
G_AD10
M24
Vddq
SBA0
AB22
Vddq
G_AD19
T23
Vddq
G_AD8
K22
Vddq
SBA2
AB23
Vddq
G_AD20
U26
Vddq
AD_STB0#
L23
Vddq
SBA6
Y22
Vddq
G_AD16
T26
Vddq
G_AD6
L26
Vddq
SB_STB#
AA24
Vddq
G_IRDY#
P23
Vddq
G_AD2
K25
Vddq
SBA1
AB25
Vddq
G_FRAME#
R26
Vddq
G_AD5
J20
Vddq
SBA7
Y25
Vddq
G_DEVSEL#
P26
Vddq
G_AD0
K26
Vddq
G_AD29
W22
Vddq
G_C/BE1#
N21
Vddq
G_AD31
Y21
Vddq
G_AD15
N26
Vddq
6.4.
All Z
To apply vectors to XOR chains on a system board, other chips on the board must be tri-stated to allow
for this vector application. This is a feature that enables all GMCH outputs to be tristated when the I/O
Controller Hub is in the XOR chain mode. This mode can also be activate using the assigned reset strap.
Tri-state GMCH Outputs
When testing other devices in the system, the GMCH outputs can be tri-stated. To tri-state these outputs
pull the SMAA10 pin low (GND) prior to deasserting RESET#. The following sequence will put the
GMCH into tri-state mode:
1. 1. Deassert RESET# high and SMAA10 low
2. 2. Assert RESET# low; maintain SMAA10 low
3. 3. Deassert RESET# high; maintain SMAA10 low
4. 4. RESET# must be maintained high for the duration of testing.
No external clocking of the GMCH is required.