PONMAC芯片BL介绍
PONMAC芯片BL介绍
PONMAC芯片BL介绍
PON MAC芯片(DS—BL2000)介绍
1、主要接口
Dual Fast Ethernet 10/100 (IEEE 802pports up to 100 Mbps full duplex sustained Ethernet traffic with 64—byte packets
Support for 512 filtering table entries
Support for 802。1p, 802.1q and
ATM cell processing and Ethernet packet processing using AAL5 adaptation method
Support of RFC-2684 with VC multiplexing or LLC encapsulation
32—bit instructions and register data width
PONMAC芯片BL介绍
PONMAC芯片BL介绍
PONMAC芯片BL介绍
Thirty two general purpose registers
16 KB instruction address space
48 KB memory data space
256 addresses for I/O data space (used by HW accelerators)
Several data addressing modes
32—bit ALU and 32-bit shift unit
Byte mask operations
32—bit accumulator register used as output for each part of the execution unit
Special instructions for activating HW accelerators and networking purposes such as scheduling
4、核心处理单元
The BL2000’s embedded CPU is a general purpose MIPS32 based controller that provides control plane functionality for the ONT system and for PON operation。
5、MIPS子系统
32—bit 4KEc RISC core
PONMAC芯片BL介绍
PONMAC芯片BL介绍
PONMAC芯片BL介绍
16 KB I-Cache, 8 KB D—Cache
Memory Management Unit (MMU)
Single—stepping of the processor as well as instruction and data virtual address beakpoints via EJTAG
6、系统接口单元(SIU)
6。1 Programmable General Purpose I/O (GPIO)
21 Bidirectional General Purpose I/O
3。3 V tolerant inputs
TTL/Open collector outputs
4mA current to drive LEDs
Peripheral Bus Interface (PBI)
24-bit address bus clocked up to 66 MHz
Configurable bus clock (BUSCLK): rates of 20 MHz, 25 MHz, 33 MHz, 50 MHz, and 66 MHz
Configurable wait states of up to 20 BUSCLK cycles
Peripheral byte access support
Support for asynchronous and synchronous bus accesses
PONMAC芯片BL介绍
PONMAC芯片BL介绍
PONMAC芯片BL介绍
Configurable assertion, de-assertion, and polarity for CS, RW, and TS
6.3 Interrupt Controller
Servicing up to 6 edge or lev
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