Product specifications

CN333 Data Sheet
Revision 1.0, January 5, 2005 -56- Device 0 Function 3 Register Descriptions - DRAM
DRAM Drive Control
Offset E0 – DRAM DQSA Drive......................................RW
7-4 High Drive
0000 Lowest....................................................default
… …
1111 Highest
3-0 Low Drive
0000 Lowest....................................................default
… …
1111 Highest
Offset E1 – DRAM DQSB Drive......................................RW
7-4 High Drive
0000 Lowest....................................................default
… …
1111 Highest
3-0 Low Drive
0000 Lowest....................................................default
… …
1111 Highest
Offset E2 – DRAM MDA, DQMA Drive.........................RW
7-4 High Drive
0000 Lowest....................................................default
… …
1111 Highest
3-0 Low Drive
0000 Lowest....................................................default
… …
1111 Highest
Offset E3 – DRAM MDB, DQMB Drive .........................RW
7-4 High Drive
0000 Lowest....................................................default
… …
1111 Highest
3-0 Low Drive
0000 Lowest....................................................default
… …
1111 Highest
Offset E4 – DRAM CS / CKE Drive................................RW
7-4 High Drive
0000 Lowest....................................................default
… …
1111 Highest
3-0 Low Drive
0000 Lowest....................................................default
… …
1111 Highest
Offset E6 – Drive Group S-Port Control (00h) .............. RW
7 DQ S-Port Control ................................... default = 0
6 CS S-Port Control .................................... default = 0
5 MAA S-Port Control................................ default = 0
4 MAB S-Port Control................................ default = 0
3 DQS S-Port Control ................................. default = 0
2-1 Reserved ........................................always reads 0
0 DQ / DQS / DQM Terminator
0 Disable................................................... default
1 Enable
Offset E8 – MAA Drive (MAA, ScmdA) ........................ RW
7-4 High Drive
0000 Lowest ................................................... default
… …
1111 Highest
3-0 Low Drive
0000 Lowest ................................................... default
… …
1111 Highest
Offset EA – MAB Drive (MAB, ScmdB) ........................ RW
7-4 High Drive
0000 Lowest ................................................... default
… …
1111 Highest
3-0 Low Drive
0000 Lowest ................................................... default
… …
1111 Highest
Offset EC – Channel A Duty Cycle Control................... RW
7-6 DQS Duty Cycle Control – Falling .........default = 0
5-4 DQS Duty Cycle Control - Rising ........... default = 0
3-2 DQ Duty Cycle Control – Falling............ default = 0
1-0 DQ Duty Cycle Control - Rising .............default = 0
Offset ED – Channel B Duty Cycle Control ................... RW
7-6 DQS Duty Cycle Control – Falling .........default = 0
5-4 DQS Duty Cycle Control - Rising ........... default = 0
3-2 DQ Duty Cycle Control – Falling............ default = 0
1-0 DQ Duty Cycle Control - Rising .............default = 0
Offset EE – DDR CKG Duty Cycle Control 1................ RW
7-2 Reserved ........................................always reads 0
1-0 DDR CKG Duty Cycle Control...............default = 0
Offset EF – DDR CKG Duty Cycle Control 2................ RW
7-2 Reserved ........................................always reads 0
1-0 DDR CKG Duty Cycle Control...............default = 0