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參數(shù)資料
| 型號： | PM2329 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 50/162頁 |
| 文件大?。?/td> | 1581K |
| 代理商： | PM2329 |
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Proprietary and Confidential to PMC-Sierra, Inc and for its Customers
’
Internal Use
Document ID: PMC-2010146, Issue 4
53
PM2329 ClassiPI Network Classification Processor Datasheet
2.4.3 Cascade Interface
The Cascade Interface allows up to 8 PM2329 devices to be connected in a cascade configuration. The
interface is designed so that the entire cascade appears to the processor as a single PM2329 having 128K
rules.
In the cascade configuration, the primary PM2329 should have its CID# set to 0. The remaining PM2329
devices should have their CID numbers set from 1 to n (n < 8) by strapping the CID[2:0] signals of each
device appropriately. The primary PM2329 has the highest priority, with priority of each PM2329
decreasing with an increase in its CID number.
CID numbers must be assigned serially starting from 0 with no gaps. For a non-cascaded configuration
with a single PM2329 device, the CID[2:0] pins of the device should be tied low during reset; this assigns
CID# 0 to this device.
The primary PM2329 device asserts the COCS signal to start packet processing in itself and all the
secondary PM2329 devices. (Packet processing and sequencing is described in the next chapter.) After
processing, each PM2329 drives its COCDOUT output pin, which, when active, indicates the completion
of the current operation by a particular PM2329. Since the COCDOUT pin of each PM2329 is connected
to the appropriate COCDIN[n] pins of all the remaining PM2329 devices, each one is informed of the
completion status of all the others.
The highest priority PM2329 chip with a match, asserts the COCM* signal. Based on a proprietary
arbitration mechanism, it gains mastership of the E-RAM bus and accesses a word based on the result of
the current operation.
2.5 System Configurations
2.5.1 Stand Alone Configuration
Stand Alone is a minimal configuration, where a single PM2329 can store up to 16K rules and perform
packet classification and other functions based on that set of rules. Stand Alone configuration affords the
smallest system component count; there is no Extended RAM and no cascaded PM2329 devices in this
configuration.
2.5.2 Cascaded Configuration
A Cascaded configuration is the most powerful configuration for packet processing using a set of PM2329
devices. Cascading allows up to 8 PM2329 devices to be cascaded, thus increasing the rule space to a
maximum of 128K rules.
PM2329 interfaces are designed to allow cascading without any glue logic. A cascaded set of devices is
designed to appear as a single device to the external processor and other system components. CID#s are
configured to uniquely identify each PM2329 device. The CID#s also define the address space (as seen by
an external processor) for each PM2329 devices
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local registers, and determine the participation of the
PM2329 in the packet processing operations. The CID# also determines the priority of the PM2329
devices; PM2329 #0 has the highest priority, and PM2329 #7 has the lowest priority.
Figure 11 shows the Cascade Bus connectivity between cascaded PM2329 devices.
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