PCIMX515CJM6C datasheet(96/184 Pages) FREESCALE

96 / 184 page

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

Freescale Semiconductor

Preliminary—Subject to Change Without Notice

Electrical Characteristics

3.7.8.8

Standard Serial Interfaces

The IPU supports the following types of asynchronous serial interfaces:

1. 3-wire (with bidirectional data line).

2. 4-wire (with separate data input and output lines).

3. 5-wire type 1 (with sampling RS by the serial clock).

4. 5-wire type 2 (with sampling RS by the chip select signal).

The IPU has four independent outputs and one input. The port can be configured to provide 3, 4, or 5-wire

interfaces.

Figure 61 depicts the timing diagram of the 3-wire serial interface. The timing diagrams correspond to

active-low IPP#_CS signal and the straight polarity of the IPP_CLK signal.

For this interface, a bidirectional data line is used outside the chip. The IPU still uses separate input and

output data lines (IPP_IND_DISPB_SD_D and IPP_DO_DISPB_SD_D). The I/O mux should provide

joining the internal data lines to the bidirectional external line according to the IPP_OBE_DISPB_SD_D

signal provided by the IPU.

9Display control up for read

DISP_UP is predefined in REGISTER

10Display control down for read

DISP_DOWN is predefined in REGISTER

11Display control up for write

DISP_UP is predefined in REGISTER

12This parameter is a requirement to the display connected to the IPU

13Data read point

Note: DISP#_READ_EN—operand of DC’s MICROCDE READ command to sample incoming data

14Loop back delay Tlbd is the cumulative propagation delay of read controls and read data. It includes an IPU output delay, a

chip-level output delay, board delays, a chip-level input delay, an IPU input delay. This value is chip specific.

Tdicur

---T

DI_CLK

ceil

DISP_UP_#

DI_CLK_PERIOD

-----------------------------------------------

⎝⎠

⎛⎞

Tdicdrw

---T

DI_CLK

ceil

DISP_DOWN_#

DI_CLK_PERIOD

-----------------------------------------------------

⎝⎠

⎛⎞

Tdicuw

---T

DI_CLK

ceil

DISP_UP_#

DI_CLK_PERIOD

-----------------------------------------------

⎝⎠

⎛⎞

Tdrp

DI_CLK

ce il

DISP#_READ_EN

DI_CLK_PERIOD

-------------------------------------------------

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