CS8900A-IQ3ZR Cirrus Logic Inc, CS8900A-IQ3ZR Datasheet - Page 97
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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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DS271F5
CS8900A
Crystal LAN™ Ethernet Controller
Entering this example, the receive buffer is empty and the
DMA Frame Count (PacketPage base + 0028h) is zero.
Frame 1 received and completely stored in on-chip RAM.
Frame 2 received and completely stored in on-chip RAM.
At this point, the CS8900A does not have sufficient buffer
space for another complete large frame (1518 bytes).
Frame 3 starts to be received and passes the DA filter.
This activates Auto-Switch DMA.
Frame 1 is placed in host memory via DMA freeing
space for the incoming Frame 3. The CS8900A updates
the DMA Frame Count, DMA Start of Frame and DMA
Byte Count registers. It then sets the RxDMA DMAFrame
bit and generates an interrupt.
Frame 2 is placed in host memory via DMA and the
CS8900A updates the DMA registers.
The host responds to the RxDMAFrame interrupt, and
reads the Frame Count register, which is cleared when
read. Since there are no receive interrupts pending, the
CS8900A exits DMA (assumes Frame 3 is still coming in).
Frame 3 is completely buffered in on-chip RAM, and
awaits processing by the host.
Figure 27. Example of Auto-Switch DMA
CIRRUS LOGIC PRODUCT DATASHEET
Enter Example Here
Exit Example
Time
Receive DMA used
during this time.
97
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