Test Connections; Table 10-13. Test Connections - IBM PPC750FX User Manual

Preliminary

10.12 Test Connections

Access to selected points in the board circuits, not available through connectors or jumpers, is provided by
small test connections. All of the test connections are small pads with a center hole. An electrical connection
can be made to any of these test connections for test purposes. These test connections are documented in
the schematic, in Table 10-13, and in Figure 10-13.
There are two kinds of test connections. The basic difference between the two is the size of the pad and the
center hole. One type of test connection is called a test point and has a large pad and center hole. Test points
are suitable for soldering wires to them for test and design purposes. The reference designators for test
points are TPnn where nn are numbers. The other type of test connection is called an ehole or test access
via. These test connections have a very small pad and center hole. The reference designators for eholes are
Unn where nn are numbers.
To determine what signal the test connection connects to, refer to the schematic. In Figure 10-13, the test
connections are labeled with their reference designators only. The actual pad and hole is not shown. Other
major components on the board are shown for assistance in locating the test connections.

Table 10-13. Test Connections

Location
TP1 U20
TP2 U20
TP3 U18 +2.5V
TP4 U50
TP5 U50
TP6 U3 System Controller
TP7 U3 System Controller
TP8 U3 System Controller
TP9 U1 750FX
TP10 U50
TP11 U3 System Controller
TP12 U1 750FX
TP13 U3 System Controller
TP14 U3 System Controller
TP15 U1 750FX
TP16 U3 System Controller
TP17 U1 750FX
TP18 U3 System Controller
TP19 U3 System Controller
TP20 U3 System Controller
TP21 U1 750FX
TP22 U3 System Controller
750FXebm_ch10.fm
June 10, 2003
Component
PPC750FX Evaluation Board
Signal
LBOOT_CS_N
LDEV_RW_N
VADJ
P07
INT_N
CS2_N
CS3_N
JTD0
QREQ0
P17
MPP13
WTI
MPP16
MPP15
CI
DEVDP0
RSRV0
MPP18
MPP17
DEVDP1
CLK_OUT0
DEVDP3
Evaluation Board Manual
Connectors
Page 69 of 115