Figure 1184.Single Pin Mseo Transfers - STMicroelectronics SPC572L series Reference Manual

e200z215An3 Nexus 3 Module
nex_mseo_b=1
Not Allowed
Note that the "End Message" state does not contain valid data on the nex_mdo[n:0] pins.
Also, It is not possible to have two consecutive "End Packet" messages. This implies the
minimum packet size for a variable length packet is 2x the number of nex_mdo[n:0] pins.
This ensures that a false end of message state is not entered by emitting two consecutive
'1's on the nex_mseo_b pin before the actual end of message.
Figure 1185
1976/2058
Figure 1184. Single pin MSEO transfers
nex_mseo_b=1
End
Message
MDO: Invalid
nex_mseo_b=1
End
Packet
illustrates the state diagram for dual pin MSEO transfers.
DocID027809 Rev 4
nex_mseo_b=1
Idle
MDO: Invalid
nex_mseo_b=0
nex_mseo_b=0
nex_mseo_b=1
nex_mseo_b=0
Start
Message
nex_mseo_b=0
Normal
Transfer
nex_mseo_b=0
RM0400