PCIMX515CJM6C datasheet(42/184 Pages) FREESCALE

42 / 184 page

i.MX51 Applications Processors for Consumer and Industrial Products, Rev. 1

Freescale Semiconductor

Preliminary—Subject to Change Without Notice

Electrical Characteristics

3.6.7

External Interface Module (WEIM)

3.6.7.1

WEIM Signal Cross Reference

Table 38 is a guide to help the user identify signals in the WEIM Chapter of the Reference Manual

Chapter that are the same as those mentioned in this data sheet.

NF21

WE high to RE low

tWHR

14T-5.45

NF22

WE high to busy

tWB

tDSR is calculated by the following formula:

Asymmetric mode:

tDSR = tREpd + tDpd + 1/2T - Tdl

Symmetric mode:

tDSR = tREpd + tDpd - Tdl2

tREpd + tDpd = 11.2 ns (including clock skew)

where tREpd is RE propogation delay in the chip including IO pad delay, and tDpd is Data propogation delay

from IO pad to EMI including IO pad delay.

tDSR can be used to determine tREA max parameter with the following formula: tREA = 1.5T - tDSR.

Tdl is composed of 4 delay-line units each generates an equal delay with min 1.25 ns and max 1 aclk

period (Taclk). Default is 1/4 aclk period for each delay-line unit, so all 4 delay lines together generates

a total of 1 aclk period. Taclk is “emi_slow_clk” of the system, which default value is 7.5 ns (133MHz).

NF17 is defined only in asymmetric operation mode.

NF17 max value is equivalent to max tRHZ value that can be used with NFC.

Taclk is “emi_slow_clk” of the system.

NF18 is defined only in Symmetric operation mode.

tDHR (MIN) is calculated by the following formula:

Tdl2 - (tREpd + tDpd)

where tREpd is RE propogation delay in the chip including IO pad delay, and tDpd is Data propogation delay

from IO pad to EMI including IO pad delay.

NF18 max value is equivalent to max tRHZ value that can be used with NFC.

Taclk is “emi_slow_clk” of the system.

Table 38. WEIM Signal Cross Reference

Reference Manual

WEIM Chapter Nomenclature

Data Sheet Nomenclature,

Reference Manual External Signals and Pin Multiplexing Chapter,

and IOMUX Controller Chapter Nomenclature

BCLK

EIM_BCLK

CSx

EIM_CSx

WE_B

EIM_RW

OE_B

EIM_OE

BEy_B

EIM_EBx

ADV

EIM_LBA

ADDR

EIM_A[27:16], EIM_DA[15:0]

ADDR/M_DATA

EIM_DAx (Addr/Data muxed mode)

Table 37. NFC—Timing Characteristics (continued)

PARAMETER

Symbol

Asymmetric

Mode Min

Symmetric

Mode Min

Max

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