Atmel SpaceWire Router SpW-10X User Manual

Ref.:   UoD_SpW-10X_ 

 

Issue:  3.4 

  

 

Date:  11

 

 

49

 

 signal when EXT_TICK_IN signal has a rising edge. If SEL_EXT_TIME is 1 then the 

 inputs are used to provide the contents of the time-code. If SEL_EXT_TIME is 0 

then the internal time-code counter provides the least-significant 6-bits of the time-code and the 

 inputs provide the most-significant 2-bits. When using the EXT_TIME_IN(7:0) 

inputs to provide the complete time-code, the time-code is only broadcast if it is a valid time-code i.e. if 
the count in bits 5:0 is one more than the internal time register of the router (see SpaceWire standard 
[AD1]). Note that only one router or node in a SpaceWire network should normally operate as a time 
master generating time codes (see SpaceWire standard [AD1]). 

EXT_TICK_OUT

EXT_TIME_OUT

 

When a valid time-code is received by the router the value of this time-code (flags plus time value) will 
be placed on the EXT_TIME_OUT outputs and the EXT_TICK_OUT signal will be set to zero.  The 

 signal is set to one a short time later, once the EXT_TIME_OUT outputs have 

stabilised, to indicate that these outputs are valid. They then remain valid until the next time-code is 
received and the EXT_TICK_OUT signal will be set to zero.  

TIME_CTR_RST

TIME_CTR  Count

 

When a rising edge is detected on TIME_CTR_RST then the time-code register is reset to zero. 

6.3  STATUS INTERFACE OPERATION 

The STAT_MUX_ADDR signal determines the output status on STAT_MUX_OUT as shown in Figure 
6-6 and in Table 6-1.  

STAT_MUX_ADDR

STAT_MUX_OUT

CLK

 

When STAT_MUX_ADDR is stable STAT_MUX_OUT is output from after each clock edge.