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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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GXM 数据表(PDF) 29 Page - National Semiconductor (TI) |
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GXM 数据表(HTML) 29 Page - National Semiconductor (TI) |
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29 / 244 page  Revision 3.1 29 www.national.com Signal Definitions (Continued) GNT[2:0]# E1, F2, D1 H2, K4, F2 O Grant Lines Grant indicates to the requesting master that it has been granted access to the bus. Each master has its own GNT# line. GNT# can be pulled away at any time a higher REQ# is received or if the master does not begin a cycle within a minimum period of time (16 SYSCLKs). 2.2.2 PCI Interface Signals (Continued) Signal Name BGA Pin No. SPGA Pin No Type Description 2.2.3 Memory Controller Interface Signals Signal Name BGA Pin No. SPGA Pin No. Type Description Note: The memory controller interface supports two types of memory configurations: SDRAM modules on the sys- tem board and JEDEC DIMM connectors. Refer to Section 4.3 “Memory Controller” on page 103 for detailed information regarding signal connections. MD[63:0] Refer to Table 2-3 Refer to Table 2-5 I/O Memory Data Bus The data bus lines driven to/from system memory. MA[12:0] Refer to Table 2-3 Refer to Table 2-5 O Memory Address Bus The multiplexed row/column address lines driven to the system memory. Supports 256 Mbit SDRAM. BA[1:0] AD26, AD25 AJ33, AK36 O Bank Address Bits These bits are used to select the component bank within the SDRAM. CS[3:0]# AE23, V25, AD23, V26 AK32, Z34, AN33, AA35 O Chip Selects The chip selects are used to select the module bank within the system memory. Each chip select corresponds to a specific mod- ule bank. If CS# is high, the bank(s) do not respond to RAS#, CAS#, WE# until the bank is selected again. RASA#, RASB# W24, W25 AB36, AB34 O Row Address Strobe RAS#, CAS#, WE# and CKE are encoded to support the differ- ent SDRAM commands. RASA# is used with CS[1:0]#. RASB# is used with CS[3:2]#. CASA#, CASB# P25, R26 W37, X36 O Column Address Strobe RAS#, CAS#, WE# and CKE are encoded to support the differ- ent SDRAM commands. CASA# is used with CS[1:0]#. CASB# is used with CS[3:2]#. WEA#, WEB# R25, R24 W33, W35 O Write Enable RAS#, CAS#, WE# and CKE are encoded to support the differ- ent SDRAM commands. WEA# is used with CS[1:0]#. WEB# is used with CS[3:2]#. |
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