Texas Instruments TMS320TCI648x - Manual (Page 25)

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2.1.2.4 SRIO Packet Type
2.2 SRIO Pins
SRIO Functional Description
The type of received packet determines how the packet routing is handled. Reserved or undefined packet
types are destroyed before being processed by the logical layer functional blocks. This prevents erroneous
allocation of resources to them. Unsupported packet types are responded to with an error response
packet.
Section 2.1.2.4 details the handling of such packets.
The type of SRIO packet is determined by the combination of Ftype and Ttype fields in the packet. Table 3
lists all supported combinations of Ftype/Ttype and the corresponding decoded actions on the packets.
Table 3. Packet Types
Ftype Ttype Packet Type
Ftype = 0 Ttype = don't care
Ftype = 2 Ttype = 0100b NREAD
Ttype = 1100b Atomic increment
Ttype = 1101b Atomic decrement
Ttype = 1110b Atomic set
Ttype = 1111b Atomic clear
Ttype = others
Ftype = 5 Ttype = 0100b NWRITE
Ttype = 0101b NWRITE_R
Ttype = 1110b Atomic test and swap
Ttype = others
Ftype = 6 Ttype = don't care SWRITE
Ftype = 7 Ttype = don't care Congestion control
Ftype = 8 Ttype = 0000b Maintenance read
Ttype = 0001b Maintenance write
Ttype = 0010b Maintenance read response
Ttype = 0011b Maintenance write response
Ttype = 0100b Maintenance port-write
Ttype = others
Ftype = 10 Ttype = don't care Doorbell
Ftype = 11 Ttype = don't care Message
Ftype = 13 Ttype = 0000b Response(+Doorbell Resp)
Ttype = 0001b Message Response
Ttype = 1000b Response w/payload
Ttype = other
Undefined Ftypes: 1,3,4,9,12,14,15
The SRIO device pins are high-speed differential signals based on Current-Mode Logic (CML) switching
levels. The transmit and receive buffers are self-contained within the clock recovery blocks. The reference
clock input is not incorporated into the SERDES macro. It uses a differential input buffer that is compatible
with the LVDS and LVPECL interfaces available from crystal oscillator manufacturers.
Table 4 describes
the device pins for the SRIO peripheral.
SPRUE13A – September 2006 Serial RapidIO (SRIO) 25
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