6.15 mDDR Memory Interface Timing Requirements
The DLPC2607 controller mDDR memory interface consists of a 16-bit wide, mDDR interface (that is, LVCMOS signaling) operated at 133.33 MHz (nominal). (see (1)(2)(3))
|
MIN |
MAX |
UNIT |
tCYCLE |
Cycle-time reference |
7500 |
|
ps |
tCH |
CK high pulse width(4) |
2700 |
|
ps |
tCL |
CK low pulse width(4) |
2700 |
|
ps |
tDQSH |
DQS high pulse width(4) |
2700 |
|
ps |
tDQSL |
DQS low pulse width(4) |
2700 |
|
ps |
tWAC |
CK to address and control outputs active |
–2870 |
2870 |
ps |
tQAC |
CK to DQS output active |
|
200 |
ps |
tDAC |
DQS to DQ and DM output active |
–1225 |
1225 |
ps |
tDQSRS |
Input (read) DQS and DQ skew(5) |
|
1000 |
ps |
(1) This includes the 200 ppm of the external oscillator (but no jitter).
(2) Output setup and hold numbers already account for controller clock jitter. Only routing skew and memory setup/hold must be considered in system timing analysis.
(3) Assumes a 30-Ω series termination on all signal lines.
(4) CK and DQS pulse duration specifications for the DLPC2607 assume it is interfacing to a 166-MHz mDDR device. Even though these memories are only operated at 133.33 MHz, according to memory vendors, the rated tCK specification (that is 6 ns) can be applied to determine minimum CK and DQS pulse duration requirements to the memory.
(5) Note that DQS must be within the t
DQSRS read data-skew window, but need not be centered.
Figure 1. Parallel I/F Frame Timing
Figure 2. Parallel and BT.656 I/F General Timing
Figure 3. DLPC2607 PDATA Bus – BT.656 I/F Mode Bit Mapping (YCrCb 4:2:2 Source)
Figure 4. Flash I/F Timing
Figure 5. DMD I/F Timing
Figure 6. mDRR Memory Address and Control Timing
Figure 7. mDRR Memory Write Dtat Timing
Figure 8. mDDR Memory Read Data Timing