mc94mx21 Freescale Semiconductor, Inc, mc94mx21 Datasheet - Page 62

• Manufacturer Part Number: mc94mx21
• Description: 333 And 350 Mhz
• Manufacturer: Freescale Semiconductor, Inc

Specifications
3.19
The External Interface Module (EIM) handles the interface to devices external to the i.MX21, including
generation of chip-selects for external peripherals and memory. The timing diagram for the EIM is shown
in
62
Figure
53, and
External Interface Module (EIM)
Write Data (negated falling)
Write Data (negated rising)
LBA (negated falling edge)
LBA (negated rising edge)
Burst Clock (falling edge)
Burst Clock (rising edge)
(HCLK) Bus Clock
Table 42
OE (falling edge)
EB (falling edge)
OE (rising edge)
EB (rising edge)
Read (Write)
Chip-select
Read Data
Address
DTACK
defines the parameters of signals.
Figure 53. EIM Bus Timing Diagram
MC94MX21 Technical Data, Rev. 1.4
1a
2a
3a
6a
6a
4a
5a
7a
9a
9a
4c
5c
7c
10a
8a
6c
7b
7d
10a
4b
5b
11
9c
8b
Freescale Semiconductor
1b
2b
3b
4d
5d
6b
9b