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| 型號(hào)： | IBM3288H2848 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 42/131頁(yè) |
| 文件大小： | 1679K |
| 代理商： | IBM3288H2848 |
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PRS28.4G
IBM Packet Routing Switch
Functional Description
Page 42 of 131
prs28.03.fm
August 31, 2000
3.9 Send Grant
Flow control is provided to the output ports via 16 send grant SND_GRANT pins. Data or control packets are
only transmitted on a given output if its SND_GRANT is active high. Otherwise, Idle Packets are transmitted
as long as the SND_GRANT is low.
These signals are treated asynchronously to the internal device logic. Therefore, if the transitions on the
SND_GRANT pins are not synchronized with the output packet flow, an exact control of the number of data,
or control, packets transmitted when SND_GRANT is high cannot be guaranteed. I.E., when SND_GRANT is
high for N * LU cycles, N-1 to N+1 data or control packets will be transmitted (if available). Similarly, when
SND_GRANT is low for N * LU, N-1 to N+1 Idle Packets will be transmitted.
However, if the SND_GRANT transitions are synchronized with the output packet flow, it is guaranteed that
exactly N data or control packets (if available) will be transmitted if SND_GRANT is high for N * LU, and that
N Idle Packets will be transmitted when SND_GRANT is low for N * LU. In order to achieve this, the synchro-
nization requirement is that the SND_GRANT signal should be stable at the device pin during its sampling
window, defined in relationship with the beginning of the transmission of the corresponding packet on device
pins (See IO Timing section).
This SND_GRANT sampling window also defines the latency of the packet transmission to react to the
changes of the SND_GRANT signal both when it is asserted or deasserted.
3.10 Receive Filter
The receive grant permits the filtering of incoming packets based on their destination. It prevents the recep-
tion of Data Packets by selected outputs. The 16 RCV_GRANT bits act as a filter of the incoming packet bit
map:
When RCV_GRANT(i) is high, reception of Data Packets in the output queue i is enabled,
When RCV_GRANT(i) is low, no incoming packets are stored in output queue i, regardless of their bit
map setting.
For the SND_GRANT, the RCV_GRANT signals are treated asynchronously to the internal logic. However, it
is possible to synchronize all 16 RCV_GRANT with the input packet flows in order to guarantee reception, or
rejection, of specific packets. To this end, the RCV_GRANT signals have to be stable on the device pins
during the sampling window, defined in relationship with the beginning of the reception of the corresponding
packet on device pins (See IO Timing section).
It is important to realize that to achieve this synchronization, all input adapters have to transmit packets at the
same time, since RCV_GRANT(n) is related to packet reception in output n for packets on all inputs.
The RCV_GRANT function is actually implemented as an extension of the Bit Map Filter on device pins
(RCV_GRANT are ANDed with the Bit Map Filter) and therefore has the exact same effect. When using the
RCV_GRANT function, the Color mechanism and the Bit Map Filter function should not used:
Only Data Packets with header Active bit set to ‘1'b and Backup bit set to ‘0'b can be transmitted, and
The Bit Map Filter has to be set to 0x‘FFFF'
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