ADV8003 Hardware Manual
Rev. B, August 2013
114
ADV8003 is configured for dual 512 Mbit memories with a 64-bit word size and bursts of 4.
sdram_size[3:0]
, IO Map,
Address 0x1A5B[7:4]
This signal is used to specify the SDRAM size. All values other than those specified here are reserved.
Function
sdram_size[3:0]
Description
0001
individual SDRAM is 256Mbit
0010
individual SDRAM is 512Mbit
0011
individual SDRAM is 1Gbit
word_size[3:0]
, IO Map,
Address 0x1A5C[7:4]
This signal is used to specify the word size on the user interface. The data width to the SDRAM is half of this value. All other values are
reserved
Function
word_size[3:0]
Description
0010
32 bits
0011
64 bits
burst_length[2:0]
, IO Map,
Address 0x1A5D[1:0]; Address 0x1A5E[7]
This signal is used to indicate the burst length of the read/write transaction.
Function
burst_length[2:0]
Description
010
Burst of 4
011
Burst of 8.
sets the direction for several of the pins on the DDR2 memory interface. By default, these pins are set to input. However, when
set to 1, this bit enables these pins to be outputs. Likewise, when
is set to 1, the DDR2 clock pin becomes an output.
rw_ctrl_oe
, IO Map,
Address 0x1AA8[7]
This bit is used to control the output enable for external memory read/write signals (ras, cas, clock, address…).
Function
rw_ctrl_oe
Description
0
Input
1
Output
ddr2_ck_oe
, IO Map,
Address 0x1AA8[6]
This bit is used to control the output enable for external memory clock signal.
Function
ddr2_ck_oe
Description
0
Input
1
Output
The PLL clock generator for the DDR2 memory interface can be set to a user defined frequency over the range of 200 to 250MHz by
setting the
2
C controls.
Summary of Contents for ADV8003
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Page 395: ...ADV8003 Hardware Manual Rev B August 2013 395 Figure 173 ADV8003 Layout Page 2...
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