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AS1163

Functional description

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A SAID device features two SIO interfaces (= Serial IO) which are used for communication

between devices and between a device and an MCU. Each SIO interface consists of a P

terminal and an N terminal. The function of each terminal depends on the configured SIO

mode.

From the functional mode point of view, a SAID is symmetrical in its two SIO interfaces.

Each of the two SIO interfaces supports several different communication modes.

Each SIO operates in half-duplex mode meaning it either receives or transmits a telegram. On

the other hand, it is possible to contemporarily receive a telegram at one SIO and transmitting

at the other SIO interface.

The expected data rate is 2.4 Mbit/s ± some allowed variance (for exact values see Table 4).

The four communication modes are:

1. “LVDS mode”: The SIO uses LVDS signaling on P and N lines for transmitting and

receiving telegrams. Manchester encoding is used to transfer DATA & CLK. Up to 15pF

capacitive load is supported.

2. “MCU mode, normal”:

Type A MCU mode: The SIO uses a single-ended mode for signaling. Incoming

commands are Manchester encoded and are expected on the SIOx_P port. Outgoing

responses are transmitted also on SIOx_P in NRZ format together with the corresponding

clock on SIOx_N.

Type B MCU mode: Implemented as a flavor of the MCU mode, is selectable by OTP

setting. Also called 2-wire SPI mode, it enables incoming communication to SAID using a

DATA line and CLK line on SIO1 port, respectively on P and N lines. Outgoing

communication is the same as for Type A MCU mode. Outgoing communication is the

same as for Type A MCU mode.

Default is MCU mode type A, but with SPI_mode bit set in OTP, the MCU mode type B is

selected.

3. “MCU mode, EOL (End Of Line)”: This is similar to “MCU mode, normal” but the SIO port

does consider itself to be at the end of the daisy chain instead of the beginning. This is

needed for some commands that require the daisy chain topology information, like for

example INIT telegrams.

4. “CAN mode” (officially known as USE mode): Communication via CAN transceiver.

SIOx_P is always in output state and transmits telegram as Manchester encoded signals

(single-ended), SIOx_N is always in input state and receives telegrams as Manchester

encoded signal (single-ended). When connecting two nodes using USE mode, the P and

N wire need to be crossed.

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