Parameterized MAC unit implementation Chen, Ming-Chih; Huang, Ing-Jer; Chen, Chung-Ho
Proceedings of the 2001 Asia and South Pacific Design Automation Conference,
01/2001
Conference Proceeding
Ethernet communication devices, such as adapter, hub, bridge and switch, all follow IEEE 802.3 standard protocol. We have designed and implemented an integrated 10/100 Mbps Ethernet MAC (Medium ...Access Control) mechanism. The MAC unit is used to handle receive/transmit processes of network packet stream. To meet the requirement of different communication devices, we design an automatic MAC unit generator. Users can select the desired number of MAC units through parametric environment setup. To verify the application of MAC unit, we provide a 10/100 Mbps layer-2 switch simulator and an automatic test pattern generator. The FPGA demo system reveals the validity of the MAC unit.
To determine the effect of endoscopic variceal sclerotherapy or ligation on portal hypertensive gastropathy, 90 cirrhotic patients with esophageal variceal bleeding were randomized to receive ...sclerotherapy (n = 44) or ligation (n = 46). Follow-up endoscopic observations of the gastric mucosa were recorded at 3-month intervals after variceal eradication. Clinical characteristics in both groups were similar. Probability for a change in the severity of portal hypertensive gastropathy was not related to method of eradication. Most cases of portal hypertensive gastropathy that changed in severity returned to baseline status with time, but the return was faster after ligation than after sclerotherapy. According to the results of multivariate analyses, sclerosant volume was the only factor associated with a significant difference between the group with static gastropathy (n = 15) and that with dynamic change in gastropathy (n = 23) after sclerotherapy. No relevant factors were found in the patients receiving ligation. We conclude that changes in the severity of portal hypertensive gastropathy after endoscopic variceal sclerotherapy or ligation are reversible. Most cases of gastropathy return to baseline status sooner or later. (Gastrointest Endosc 1995;42:139-44.)
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