SPEAR1340 datasheet(14/200 Pages) STMICROELECTRONICS

14 / 200 page

Device functions

SPEAr1340

14/200

Doc ID 023063 Rev 4

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Byte-aligned addressing for data buffer support

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Dual-buffer (ring) or linked-list (chained) descriptor chaining

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Descriptor architecture that allows large blocks of data transfer with minimum CPU

intervention

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Comprehensive status reporting for normal operation and transfers with errors

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Individual programmable burst size for transmit and receive DMA engines for optimal

host bus utilization

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Programmable interrupt options for different operational conditions

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Complete per-frame transmit/receive interrupt control

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Round-robin or fixed-priority arbitration between receive and transmit engines

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Start/stop modes

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Separate ports for host CSR access and host data interface

The GMAC audio video (AV) enables transmission of time-sensitive traffic over bridged

local area networks (LANs). The GMAC AV has the following features:

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Compliant to IEEE 802.1-AS standard, version D6.0: specifies the protocol and

procedures used to ensure that the synchronization requirements are met for time-

sensitive applications

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Compliant to IEEE 802.1-Qav standard, version D6.0: allows the bridges to provide

time-sensitive and loss-sensitive real-time audio video data transmission (AV traffic). It

specifies the priority regeneration and controlled bandwidth queue draining algorithms

that are used in bridges and AV traffic sources

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Supports one additional channel (channel 1) on the transmit and receive paths for AV

traffic in 100 Mbps and 1000 Mbps modes. The channel 0 is available by default and

carries the legacy best-effort Ethernet traffic on the transmit side.

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Supports IEEE 802.1-Qav specified credit-based shaper (CBS) algorithm for the

additional transmit channels

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Provides separate DMA, TxFIFO, and RxFIFO MTL for the additional channel (to avoid

“head of line blocking” issues); the system-side interface remains the same.

The GMAC has the following additional features for monitoring, testing, and debugging:

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Supports internal loopback on the GMII/MII for debugging

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Provides DMA states (Tx and Rx) as status bits

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Provides debug status register that gives status of FSMs in transmit and receive data-

paths and FIFO fill-levels

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Application abort status bits

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MMC (RMON) module in the GMAC core

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Current Tx/Rx buffer pointer as status registers

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Current Tx/Rx descriptor pointer as status registers

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Statistical counters that help in calculating the bandwidth served by each transmit

channel when AV support is enabled

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