DS31256 Maxim Integrated Products, DS31256 Datasheet - Page 87

• Manufacturer Part Number: DS31256
• Description: IC CTRLR HDLC 256-CHANNEL 256BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS31256

• Controller Type: HDLC Controller
• Interface: Serial
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 500mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Host Actions
The host typically handles the receive DMA as follows:
1) The host is always trying to make free data buffer space available and therefore tries to fill the free-
2) The host either polls, or is interrupted, when some incoming packet data is ready for processing.
3) The host then reads the done-queue descriptor circular queue to find out which channel has data
4) The host then reads the receive packet descriptor and begins processing the data.
5) The host then reads the next descriptor pointer in the link-listed chain and continues this process
6) The host then checks the done-queue descriptor circular queue to see if any more data buffers are
queue descriptor.
available, what the status is, and where the receive packet descriptor is located.
until either a number (from 1 to 7) of descriptors have been processed or an end of packet has been
reached.
ready for processing.
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