DS31256 Maxim Integrated Products, DS31256 Datasheet - Page 88

• 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

Figure 9-1. Receive DMA Operation
00h
08h
10h
00h
04h
08h
0Ch
EOF Status
EOF Status
EOF Status
EOF Status
unused
unused
unused
Free Queue Descriptors
Done Queue Descriptors
Free Data Buffer Address
Free Data Buffer Address
Free Data Buffer Address
(circular queue)
(circular queue)
CH #5
CH #2
CH #9
CH #
Free Desc. Ptr.
Free Desc. Ptr.
Free Desc. Ptr.
dmarbd
Desc. Ptr.
Desc. Ptr.
Desc. Ptr.
Desc. Ptr.
Status
Status # Bytes Next Desc. Ptr.
Status # Bytes Next Desc. Ptr.
Status # Bytes Next Desc. Ptr.
Status # Bytes Next Desc. Ptr.
Open Descriptor Space
Available for Use by the DMA
Open Descriptor Space
Available for Use by the DMA
88 of 183
Timestamp
Timestamp
Timestamp
Timestamp
Timestamp
Data Buffer Address
Data Buffer Address
Data Buffer Address
Data Buffer Address
Data Buffer Address
# Bytes Next Desc. Ptr.
Unused
Free Packet Descriptors & Data Buffers
Used Packet Descriptors & Data Buffers
CH #5
CH #2
CH #2
CH #9
CH #2
Free Data Buffer
(up to 8188 bytes)
Free Data Buffer
(up to 8188 bytes)
First Filled
Data Buffer
for Channel 2
Single Filled
Data Buffer
for Channel 5
Second Filled
Data Buffer
for Channel 2
Last Filled
Data Buffer
for Channel 2
Single Filled
Data Buffer
for Channel 9