DS33Z41 Maxim Integrated Products, DS33Z41 Datasheet - Page 81
DS33Z41
Manufacturer Part Number
DS33Z41
Description
Network Controller & Processor ICs Quad Inverse-Multipl exing Ethernet Mappe
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33Z41.pdf
(167 pages)
Specifications of DS33Z41
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Register Name:
Register Description:
Register Address:
9.3 Arbiter Registers
The Arbiter manages the transport between the Ethernet port and the Serial Interface. It is responsible for
queuing and dequeuing data to an external SDRAM. The arbiter handles requests from the HDLC and MAC to
transfer data to/from the SDRAM. The base address of the Arbiter register space is 0040h.
9.3.1 Arbiter Register Bit Descriptions
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 7 to 0: Receive Queue Size (RQSC7 to RQSC0). These 7 bits of the size of receive queue associated with
the connection. Receive queue is for data arriving from the MAC to be sent to the WAN. The Queue address size
is defined in increments of 32 x 2048 bytes. The queue size is AR.RQSC1 multiplied by 32 to determine the
number of 2048 byte packets that can be stored in the queue. This queue is constructed in the external SDRAM.
Note: Queue size of 0 is not allowed and should never be set.
Bit #
Name
Default
Bits 7 to 0: Transmit Queue Size (TQSC7 to TQSC0). This is size of transmit queue associated with the
connection. The queue address size is defined in increments of 32 packets. The range of bytes will depend on the
external SDRAM connected to the DS33Z41. Transmit queue is the data queue for data arriving on the WAN that
is sent to the MAC. Note that queue size of 0 is not allowed and should never be set.
RQSC7
TQSC7
7
0
7
0
RQSC6
TQSC6
6
0
6
0
AR.RQSC1
Arbiter Receive Queue Size Connection
40h
AR.TQSC1
Arbiter Transmit Queue Size Connection 1
41h
RQSC5
TQSC5
5
1
5
0
RQSC4
TQSC4
81 of 167
4
1
4
0
RQSC3
TQSC3
3
1
3
0
RQSC2
TQSC2
2
1
2
0
RQSC1
TQSC1
1
0
1
1
RQSC0
TQSC0
0
1
0
1
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