Beckhoff ET1200 User Manual download pdf (Page 49)

PDI Description

Slave Controller – ET1200 Hardware Description III-39

Table 43: Read/Write timing diagram symbols

Symbol

Comment

A15..A0

Address bits [15:0]

D0_7..D0_0

D1_7..D1_0

Data bits byte 0 [7:0]

Data bits byte 1 [7:0]

I0_7..I0_0

I1_7..I1_0

I2_7..I2_0

Interrupt request register 0x0220 [7:0]

Interrupt request register 0x0221 [7:0]

Interrupt request register 0x0222 [7:0]

C0_2..C0_0

C1_2..C1_0

Command 0 [2:0]

Command 1 [2:0] (3 byte addressing)

Status

0: last SPI access had errors

1: last SPI access was correct

BUSY OUT

Enable

0: No Busy output, tread is relevant

1: Busy output on SPI_DO (edge sensitive)

BUSY

0: SPI slave has finished reading first byte

1: SPI slave is busy reading first byte

SPI_DO (MISO)

SPI_DI (MOSI)

SPI_CLK*

DI_setup

DI_hold

CLK_to_DO_valid

CLK_to_DO_invalid

Figure 15: Basic SPI_DI/SPI_DO timing (*refer to timing diagram for relevant edges of SPI_CLK)

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 69 70

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Beckhoff ET1200 User Manual Page 49