Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
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21.8.6 DDRSDRC Timing Parameter 2 Register
Name: DDRSDRC_TPR2
Address: 0xFFFFE614 (0), 0xFFFFE414 (1)
Access: Read/Write
This register can only be written if the bit WPEN is cleared in “DDRSDRC Write Protect Mode Register” on page 271.
• TXARD: Exit Active Power Down Delay to Read Command in Mode “Fast Exit”.
Reset value is 2 cycles.
This field defines the delay between CKE set high and a Read Command in number of cycles. Number of cycles is
between 0 and 15.
Note: This field is found only in DDR2-SDRAM devices.
• TXARDS: Exit Active Power Down Delay to Read Command in Mode “Slow Exit”.
Reset value is 6 cycles.
This field defines the delay between CKE set high and a Read Command in number of cycles. Number of cycles is
between 0 and 15.
Note: This field is found only in DDR2-SDRAM devices.
• TRPA: Row Precharge All Delay
Reset value is 0 cycles.
This field defines the delay between a Precharge ALL banks Command and another command in number of cycles. Num-
ber of cycles is between 0 and 15.
Note: This field is found only in DDR2-SDRAM devices.
• TRTP: Read to Precharge
The Reset value is 2 cycles.
This field defines the delay between Read Command and a Precharge command in number of cycle.
Number of cycles is between 0 and 7.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
–TRTP TRPA
76543210
TXARDS TXARD