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Table 3-16 Ground Pins
Pin Name
VSS
VSSAHT
VSSAPCIE
VSSLT
VSSLTP18
Total Ground Pin Count
3.15
Strapping Options
The RS780E 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 RS780E.
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.
45732 AMD 780E Databook 3.10
3-14
(Continued)
Pin Count
Ball Reference
34
AA14, AB11, AB15, AB17,
AB19, AB21, AC12, AE14,
AE20, D11, E14, E15, 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 3-17
are defined active low. To select "1", the strap pins must be pulled up to VDD33
Comments
Common Ground
Ground pin for HyperTransport interface PLL
®
Ground for PCI Express
Interface
Ground for LVDS interface
Ground for LVDS interface PLL macro
Table 3-17, "Strap Definitions for the RS780E,"
Table 3-17
to set their values to "1".
Table 3-17
to set their values to "0".
© 2009 Advanced Micro Devices, Inc.
Strapping Options
Proprietary
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