CS8900A-IQ3ZR Cirrus Logic Inc, CS8900A-IQ3ZR Datasheet - Page 94
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CS8900A-IQ3ZR
Manufacturer Part Number
CS8900A-IQ3ZR
Description
Ethernet ICs IC 10Mbps Ethernet Controller 3.3V
Manufacturer
Cirrus Logic Inc
Datasheet
1.CS8900A-CQZ.pdf
(138 pages)
Specifications of CS8900A-IQ3ZR
Ethernet Connection Type
10Base- 2, 10Base- 5, 10Base- F, 10Base- T
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Product
Ethernet Controllers
Standard Supported
IEEE 802.3
Data Rate
10 Mbps
Maximum Operating Temperature
+ 85 C
Package / Case
LQFP-100
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
CS8900A-IQ3ZR
Manufacturer:
Cirrus Logic Inc
Quantity:
10 000
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5.4 Auto-Switch DMA
5.4.1 Overview
The CS8900A supports a unique feature,
Auto-Switch DMA, that allows it to switch be-
tween Memory or I/O mode and Receive DMA
automatically. Auto-Switch DMA allows the
CS8900A to realize the performance advan-
tages of Memory or I/O mode while minimizing
the number of missed frames that could result
due to slow processing by the host.
5.4.2 Configuring the CS8900A for Auto-
Switch DMA
Auto-Switch DMA mode requires the same
configuration as Receive-DMA-only mode,
with one exception: the AutoRxDMAE bit
(Register 3, RxCFG, Bit A) must be set, and
94
Read the DMA frame Count (C
Host Enters Interrupt Routine
(PacketPage base + 0028h)
CIRRUS LOGIC PRODUCT DATASHEET
Figure 25. RxDMA Only Operation
C
Yes
Process the
DMA
No
RxDMA
bit set?
Frame
C
= 0 ?
DMA
Frames
Yes
No
the RxDMAonly bit (Register 3, RxCFG, Bit 9)
must be clear (see Section 5.3 on page 90,
Configuring the CS8900A for DMA Operation).
In Auto-Switch DMA mode, the CS8900A op-
erates in non-DMA mode if possible, only
switching to slave DMA if necessary.
Note that if the AutoRxDMAE bit and the RxD-
MAonly bit (Register 3, RxCFG, bit 9) are both
set, the CS8900A uses DMA for all receive
frames.
5.4.3 Auto-Switch DMA Operation
Whenever a frame begins to be received in
Auto-Switch DMA mode, the CS8900A checks
to see if there is enough on-chip buffer space
to store a maximum length frame. If there is,
the incoming frame is pre-processed and buff-
DMA
)
Process other events
that caused interrupt
Process other events
that caused interrupt
Crystal LAN™ Ethernet Controller
CS8900A
DS271F5
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