IMX28CEC datasheet(34/70 Pages) FREESCALE

34 / 70 page

i.MX28 Applications Processors Data Sheet for Consumer Products, Rev. 1

Freescale Semiconductor

3.5.3.4

LPDDR1 Input AC Timing

Figure 8 and Table 38 show input AC timing for LPDDR1.

Figure 8. LPDDR1 Input AC Timing

3.5.4

Ethernet MAC Controller (ENET) Timing

The ENET is designed to support both 10- and 100-Mbps Ethernet networks compliant with IEEE 802.3.

An external transceiver interface and transceiver function are required to complete the interface to the

media. The ENET supports 10/100-Mbps MII (18 pins altogether), 10/100-Mbps RMII (10 pins, including

serial management interface), for connection to an external Ethernet transceiver. All signals are compatible

with transceivers operating at a voltage of 3.3 V.

The following subsections describe the timing for MII and RMII modes.

Table 38. DDR2 Input AC Timing

Description

Symbol

Min

Max

Unit

DDR20

Positive DQS latching edge to associated CK edge

tDQSCK

DDR21

DQS to DQ input skew

tDQSQ

0.25 tCK

–0.85

0.25 tCK

–0.5

DDR22

DQS to DQ input hold time

tQH

0.25 tCK

+0.75

0.25 tCK

+ 1

EMI_CLK

EMI_CLKN

EMI_DQS

DDR21

DDR22

DDR20

EMI_DQ

EMI_DQSN

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