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2. Serial RapidIO Interface > Multicast Event Control Symbols
56
Tsi574 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
2.5.2
Generating an MCS
The Tsi574 supports the generation of an MCS in two ways. The first method is called the
software
usage model
which use of a maintenance write transaction in a port (see
Multicast-Event Control Symbol Register” on page 314
). The write operation to this port does not
complete — that is, no response is sent — until the MCS is enqueued for transmission. Subsequent
writes to the register are ignored until the MCS is transmitted. A register write can also be performed
from both JTAG and I
2
C.
The Tsi574 also supports a
hardware usage model
, which generates an MCS using the MCES pin as an
input. When enabled, a transition on the MCES pin signals all ports that a request to transmit an MCS
is received. All ports enabled to forward multicast control symbols then transmit an MCS (see
“RapidIO Serial Port x Control CSR” on page 273
). The minimum time between two transitions on the
MCES pin is 1
s. For example, when the host needs to create a “
heartbeat
” for the entire system at
125kHz, it should use a 62.5kHz clock to generate the pulse driving the MCES pin.
2.5.3
Restrictions
Only one port on the Tsi574 should be assigned to receive Multicast-Event control symbols.
MCES_CTRL setting should be completed before traffic starts. Changing the MCES_CTRL
setting during operation can result in the transmission of spurious MCES.
If multiple ports receive Multicast-Event control symbols closely spaced in time, or if a single
port receives multicast control symbols spaced closely in time, only one control symbol is
forwarded correctly. The other control symbols are discarded. The minimum separation
between MCS is the time, on the port with the lowest possible aggregate baud rate, to send at
least 64 code groups. The 64 code groups is taken from the lowest clock speed (port rate) in
the system.
Содержание IDT Tsi574
Страница 1: ...IDT Tsi574 Serial RapidIO Switch User Manual June 6 2016 Titl...
Страница 20: ...About this Document 20 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 34: ...1 Functional Overview JTAG Interface 34 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 100: ...4 Internal Switching Fabric Packet Queuing 100 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 224: ...11 Signals Pinlist and Ballmap 224 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 490: ...B Clocking P_CLK Programming 490 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...
Страница 512: ...Index 512 Tsi574 User Manual June 6 2016 Integrated Device Technology www idt com...