參數(shù)資料
型號: RIVA128
廠商: 意法半導體
英文描述: RIVA 128⑩ 128-BIT 3D MULTIMEDIA ACCELERATOR
中文描述: 麗娃128⑩128位3D多媒體加速器
文件頁數(shù): 37/85頁
文件大?。?/td> 609K
代理商: RIVA128
128-BIT 3D MULTIMEDIA ACCELERATOR
RIVA128ZX
37/85
6.4
Separate clock signals
FBCLK0
and
FBCLK1
are provided for each bank of memory to give reduced
clock skew and loading. Additionally there is a clock feedback loop between
FBCLK2
and
FBCLKFB
.
It is recommended that long traces are used without tunable components. If the layout includes provision
for expansion to 8MBytes, the clock path to the 4MByte parts should be at the end of the trace, and the
clock path to the 8MByte expansion located between the RIVA128ZX and the 4MByte parts as shown in
Figure 32.
FBCLK2
and
FBCLKFB
should be shorted together as close to the package as possible.
Figure 32.
Recommended memory clock layout
LAYOUT OF FRAMEBUFFER CLOCK SIGNALS
6.5
Figure 33.
FRAMEBUFFER INTERFACE TIMING SPECIFICATION
SDRAM/SGRAM I/O timing diagram
Table 10.
SDRAM/SGRAM I/O timing parameters
Symbol
Parameter
Min.
Max.
Unit
Notes
-10
-12
-10
-12
t
CK
t
CH
t
CL
t
AS
t
AH
t
DS
CLK period
10
12
-
-
ns
CLK high time
3.5
4.5
-
-
ns
CLK low time
3.5
4.5
-
-
ns
Address setup time
3
4
-
ns
Address hold time
1
1
-
ns
Write data setup time
3
4
-
ns
RIVA128ZX
512K
x32
512K
x32
512K
x32
512K
x32
Bank 1
Bank 0
Expansion
to 8MBytes
FBCLK0
FBCLK1
t
t
FBCLK2
FBCLKFB
t
CH
t
CK
t
CL
t
AS
, t
DS
t
AH
, t
DH
t
LZ
t
AC
t
OH
FBCLKx
FBA[10:0], FBD[63:0]
FBD[63:0]
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