PXD20 Datasheet, PDF (112/130 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Electrical characteristics
4.18.5 DRAM interface
DDR Interface specification from ‘MCD — 32 Bit Automotive MCU — CMOS090LP2’ I/O Pad
Specification Revision 1.5 — May14th 2008.
This device supports SDR, DDR1, DDR2 half and full strengths, as well as LPDDR half and full speeds.
Table 57 shows the SRE settings for the different modes.
Table 57. Pad mode configurations
ipp_sre[2:0]
000
001
010
011
100
101
110
111
Mode
1.8V LPDDR Half Speed
1.8V LPDDR Full Speed
1.8V DDR2 Half Strength
2.5V DDR1
Not supported
Not supported
1.8V DDR2 Full Strength
SDR
NOTE:
The specifications given in Table 58 are preliminary.
Table 58. LPDDR, DDR, and DDR2 (DDR2-250) SDRAM timing specifications^{1 2 3}
No. Symbol
Parameter
Min
Max
Unit
1
F CC Frequency of Operation (Clock Period)
N/A
125
1.1 t_CK CC Clock period
2 V_IX-AC CC MCK AC differential crosspoint voltage⁴
3
t_CH CC CK HIGH pulse width ^{4, 5}
4
t_CL CC CK LOW pulse width ^{4, 5}
5 t_DQSS CC Skew between MCK and DQS transitions^{5, 6}
6 t_OS(base) CC Address and control output setup time relative to MCK
rising edge^{5, 6}
N/A
8
V_{DDE_DR} × 0.5 – 0.1 V_{DDE_DR} × 0.5 + 0.1
0.47
0.53
0.47
0.53
150
150
(tCK/2) – 1000
N/A
7 t_OH(base) CC Address and control output hold time relative to MCK
rising edge^{5, 6}
(tCK/2) + 1000
8 t_DS1(base) CC DQ and DM output setup time relative to DQS^{5, 6}
9 t_DH1(base) CC DQ and DM output hold time relative to DQS^{5, 6}
10 t_DQSQ CC DQS-DQ skew for DQS and associated DQ inputs⁵
(tCK/4) – 750
(tCK/4) + 750
–(tCK/4) – 600
11 t_DQSEN CC DQS window start position related to CAS read
command^{4, 5, 6, 7, 8}
TBD
1 _{At recommended operating conditions with VDDE_DR of ±5%.}
2 _{VDDE_DR value is 1.8 for DDR2 mode, 2.5 V for DDR1 mode, and 1.8 V for LPDDR mode.}
3 _{CZ at –40, 140, 25} o_C.
N/A
N/A
N/A
(tCK/4) – 600
TBD
MHz
ns
V
TCK
tCK
ps
ps
ps
ps
ps
ps
ps
PXD20 Microcontroller Data Sheet, Rev. 2
112
Preliminary—Subject to Change Without Notice
Freescale Semiconductor