SAP5SD-A-G1-R datasheet(43/66 Pages) IDT

43 / 66 page

SAP51 / SAP5S Datasheet

January 28, 2016

5.13.2. Logic Controlled Reset

The SAP5 also becomes reset after reception of Reset_Slave or Broadcast_Reset commands, expiration of the

(enabled) Communication Watchdog, or entering a prohibited state machine state (i.e., due to heavy EMI).

5.13.3. External Reset

The SAP5 can be reset externally by pulling the DSTBn pin LOW for more than the minimum reset time. The

external reset input function is provided in every operational mode of the SAP5: Slave Mode and Master/Repeater

Mode. The signal timings are given in Table 5.20.

Table 5.20 Timing of External Reset

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNIT

DSTBn low time for no reset initiation

tnoRESET

Reset execution time:

DSTBn H/L transition to Hi-Z output drives at DO[3:0], P[3:0]

tRESET

State Machine initialization time after reset (EEPROM read out)

tINIT

Figure 5.6

Timing Diagram External Reset via DSTBn

DSTBn

D[3:0]

tnoRESET

P[3:0]

Hi-Z

Data port output data

Parameter port output data

External Reset

tRESET

Hi-Z

tINIT

The external reset is generated as “edge sensitive” to the expiration of the tRESET timer. The initialization

procedure is starting immediately after the event, independent of the state of DSTBn. The external reset state

persists if DSTBn still remains low after tRESET + tINIT. The corresponding error state display is described in section

5.11.

5.14. UART

The UART performs a syntactical and timing analysis of the telegrams received at the AS-i input channel. It

converts the pulse-coded AS-i input signal into a Manchester-II-coded bit stream and provides the receive register

with decoded telegram bits. The UART also realizes the Manchester-II-coding of a slave answer.

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