tm1300 NXP Semiconductors, tm1300 Datasheet - Page 178
tm1300
Manufacturer Part Number
tm1300
Description
Tm-1300 Media Processor
Manufacturer
NXP Semiconductors
Datasheet
1.TM1300.pdf
(533 pages)
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TM1300 Data Book
Table 12-3. Examples of Memory Configurations
Table 12-4. Memory Interface Configuration
Registers
Table 12-5. MM_CONFIG Fields
external input clock TRI_CLKIN; the PLL output deter-
mines the operating frequency of the memory interface
and SDRAM devices. The default value is ‘0’, which im-
plies a 2:1 memory:external ratio. A value of ‘1’ implies a
3:1 ratio.
12-4
MM_CONFIG
PLL_RATIOS
REFRESH Refresh interval in memory clock cycles.
(MB)
Size
16
24
32
48
64
8
Field
SIZE
Register
Ranks
1
2
1
1
2
3
1
1
2
4
3
4
Default value 1000 (0x03E8).
Memory rank size
Describes external memory configuration
Controls separate memory and CPU PLLs
(phase-locked loops)
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
one 4 512K 32 SDRAM
two 2 512K 16 SDRAM
two 2 512K 16 SDRAM
Rank Configurations
two 4 1M 16 SDRAM
two 4 2M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
two 4 1M 16 SDRAM
four 2 1M 8 SDRAM
four 4 2M 8 SDRAM
PRODUCT SPECIFICATION
Function
Purpose
0
1
2
3
4
5
6
7
Max.
MHz
143
143
143
143
143
143
143
143
143
143
133
133
Reserved
512KB
1MB
2MB
4MB
8MB
16MB
Reserved
MB/s
Peak
572
572
572
572
572
572
572
572
572
572
532
500
Table 12-6. PLL_RATIOS Fields
CD (CPU PLL disable). The 1-bit CD field determines
whether or not the CPU PLL is turned on. The reset value
is ‘1’, which disables operation of the CPU PLL and dis-
sipates almost no power. For normal operation the value
should be zero, enabling the CPU PLL.
CB (CPU PLL bypass). The 1-bit CB field determines
whether the input or the output of the CPU PLL drives
TM1300’s core logic. The default value is ‘1’, which caus-
es the TM1300 core to be clocked by the input of the
CPU PLL (i.e., the memory interface clock). A value of ‘0’
causes normal operation, and the core is clocked by the
output of the CPU PLL.
Note that if both CB and SB are set to ‘1’ (bypass the
CPU PLL and the SDRAM PLL), TM1300’s core logic is
effectively clocked at the external input frequency.
Note: it is illegal to use the output of a disabled PLL. For
example, it is illegal to have CD set to ‘1’ while CB is set
to ‘0’.
SD (SDRAM PLL disable). The 1-bit SD field deter-
mines whether or not the SDRAM PLL is turned on. The
default value is ‘1’, which disables the SDRAM PLL. In
this state, it dissipates almost no power. For normal op-
eration the value should be ‘0’, enabling the SDRAM
PLL.
SB (SDRAM PLL bypass). The 1-bit SB field deter-
mines whether the input or the output of the SDRAM PLL
drives the memory interface and memory devices. The
default value is ‘1’, which causes the memory system to
be clocked by the input of the SDRAM PLL (TM1300’s
external input clock). A value of ’0’ causes normal oper-
ation, and the memory system is clocked by the output of
the SDRAM PLL.
Field
CR
SR
CD
CB
SD
SB
CPU:memory ratio
Memory:external ratio
CPU PLL Disable
CPU PLL bypass
SDRAM PLL Disable
SDRAM PLL bypass
Philips Semiconductors
Function
5–7 Reserved
0
1
2
3
4
0
1
0
1
0
1
0
1
0
1
1:1
2:1
3:2
4:3
5:4
2:1
3:1
CPU PLL on
CPU PLL off
CPU
CPU
SDRAM PLL on
SDRAM PLL off
Memory
Memory
PLL
Memory
PLL
external
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