Ground Pins; Strapping Options; Table 3-10 Ground Pins; Table 3-11: Strap Definitions For The Rx881 - AMD RX881 Data Book

Ground Pins

3.9 Ground Pins

Table 3-10 Ground Pins

Pin Name
AVSSDI
AVSSQ
IOPLLVSS
PLLVSS
VSS
VSSAHT
VSSAPCIE
VSSLT
VSSLTP18
Total Ground Pin Count
3.10

Strapping Options

The RX881 provides strapping options to define specific operating parameters. The strap values are latched into internal
registers after the assertion of the POWERGOOD signal to the RX881.
shows the definitions of all the strap functions. These straps are set by one of the following four methods:
•
Attaching pull-up resistors to specific strap pins listed in
•
Attaching pull-down resistors to specific strap pins listed in
•
Downloading the strap values from an I
representative for details).
•
Setting through an external debug port, if implemented (contact your AMD CSS representative for details).
All of the straps listed in
through resistors. To select "0", the strap pins must be pulled down to VSS through resistors. During reset, the strap pins
are undriven, allowing the external pull-up or pull-down to pull a pin to "0" or "1." The values on the strap pins are then
latched into the device and used as operational parameters. However, for debug purposes, those latched values may be
overridden through an external debug strap port or by a bit-stream downloaded from a serial EEPROM.
© 2011 Advanced Micro Devices, Inc.
Proprietary
Pin Count Ball Reference
1 G15
1 H14
1 AD23
1 B12
37 AA14, AB11, AB15, AB17,
AB19, AB21, AC12, AE14,
AE20, D11, E14, E15, F18,
F19, G17, G8, J12, J15, K11,
K14, L12, L15, M11, M14, N13,
P12, P15, R11, R14, T12, U11,
U14, U15, V12, W11, W15,
Y18
27 A25, AD25, D23, E22, G22,
G24, G25, H19, H20, J22,
L17, L22, L24, L25, M20, N22,
P20, R19, R22, R24, R25,
U22, V19, W22, W24, W25,
Y21
40 A2, AA4, AB1, AB2, AB5, AB7,
AC3, AC4, AE1, AE4, B1, D3,
D5, E4, G1, G2, G4, H7, J4,
L1, L2, L4, L7, M6, N4, P6, R1,
R2, R4, R7, U4, V6, V7, V8,
W1, W2, W4, W7, W8, Y6
7 C14, C16, C18, C20, C22,
D15, E20
1 B13
116
2
C serial EEPROM (for debug purpose only; contact your AMD CSS
Table 3-11 are defined active low. To select "1", the strap pins must be pulled up to VDD33
Comments
Connect the pin to common ground.
Connect the pin to common ground.
Connect the pin to common ground.
Connect the pin to common ground.
Common Ground
Ground pin for HyperTransport interface PLL
Ground for PCI Express Interface
Connect these pins to common ground
Connect the pin to common ground
Table 3-11, "Strap Definitions for the RX881,"
Table 3-11 to set their values to "1".
Table 3-11 to set their values to "0".
46136 AMD RX881 Databook 1.40
3-9