TC1796
Peripheral Units (Vol. 2 of 2)
Micro Link Interface (MLI)
User’s Manual 23-22 V2.0, 2007-07
MLI, V2.0
too. This check is used as life-sign of the receiver and the MLI transmitter can detect
whether the receiver is able to react in-time to the transmitter actions (see also
Chapter 23.1.3.4).
Figure 23-17 MLI Handshake without Error Indication
23.1.3.3 Ready Delay Time
In order to support significant propagation delays, the handshake signal TREADY is
evaluated with respect to TVALID and TCLK in an time interval called Ready Delay Time
after the end of the frame (see Figure 23-17). The length of the Ready Delay Time is
programmable, defining the size of the time interval.
When a transmission is finished (RVALID becomes 0), the MLI receiver checks the
received frame for correct reception (parity error). If no parity error has been detected,
the MLI receiver asserts its RREADY signal again to 1 to indicate the correct reception
with the next falling edge of RCLK. The MLI transmitter checks its TREADY input with
each rising edge of TCLK after TVALID has become 0 and increments a counter. This
counter is started from 0 at the end of a frame transmission (TVALID becomes 0) and
counts TCLK periods (Ready Delay Time Counter). If the condition TREADY = 1 is
detected before the programmed Ready Delay Time has elapsed, the MLI receiver has
indicated a frame reception without parity error to the MLI transmitter. In this case, a new
frame transmission can be started. The transfer handshake signalling without a parity
error indication is shown in Figure 23-17.
Figure 23-18 shows the transfer handshake if a parity error condition has been detected
by the MLI receiver and indicated to the MLI transmitter. In this case, the receiver waits
a programmable number of RCLK clock cycles before setting RREADY to 1. If the
TREADY = 1 condition is detected by the transmitter after the ready delay has elapsed,
a parity error has been indicated by the MLI receiver. In this case, it is assumed that the
MLI receiver has detected a frame with a parity error and has discarded the frame. The
MCT05874_mod
TVALID
TDATA
TREADY
TCLK
Ready Delay Time
PFC
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