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AGP command codes[edit]
Like PCI, each AGP transaction begins with an address phase, communicating an address and 4-bit command code. The possible commands are different from PCI, however:
000p
Read
Read 8×(AD[2:0]+1) = 8, 16, 24, ..., 64 bytes. The least significant bit p is 0 for low-priority, 1 for high.
001x
(reserved):
010p
Write
Write 8×(AD[2:0]+1) = 8–64 bytes.
011x
(reserved):
100p
Long read
Read 32×(AD[2:0]+1) = 32, 64, 96, ..., 256 bytes. This is the same as a read request, but the length is multiplied by four.
1010
Flush
Force previously written data to memory, for synchronization. This acts as a low-priority read, taking a queue slot and returning 8 bytes of random data to indicate completion. The address and length supplied with this command are ignored.
1011
(reserved):
1100
Fence
Bu xotira devor sifatida harakat, har qanday quyidagi so'rovlar oldin barcha oldingi AGP so'rovlar to'liq talab. Odatda, yuqori ishlashi uchun, AGP juda zaif mustahkamlik modelini foydalanadi, va keyinchalik yozish oldingi o'qish o'tishi imkonini beradi. (Masalan, "1 yozing, 2 yozing, o'qing, 3 yozing, 4 yozing" so'rovlarini yuborgandan so'ng, barchasi bir xil manzilga O'qilgan har qanday qiymatni 2 dan 4 gacha qaytarishi mumkin. Faqat 1 ni qaytarish taqiqlanadi, chunki quyidagi o'qishdan oldin yozish kerak.) Bu operatsiya har qanday navbat uya talab qilmaydi.
1101
Ikki manzil aylanishi
Yuqoridagi manzilga so'rov yuborishda 2³², bu ikkinchi manzil tsikli qo'shimcha manzil bitlari bilan bajarilishini ko'rsatish uchun ishlatiladi. Bu odatdagi PCI dual manzil tsikli kabi ishlaydi; u past darajadagi 32 bit manzil (va uzunlik) bilan birga keladi va quyidagi tsikl yuqori 32 manzil bitlarini va kerakli buyruqni o'z ichiga oladi. Ikki ko'chadan bir so'rov qilish, va talab navbatda faqat bitta uyasi olish. Bu talab kodi tomoni-tasma hal bilan ishlatiladi emas.
111x
(himoyalangan):
AGP 3.0 yuqori ustuvor talablarini va uzoq o'qish buyruqlarni tushib, ular oz ishlatilgan bo'lib,. Bundan tashqari, faqat to'rt talab turlarini qoldirib, shunday qilib, er-xotin manzil aylanishiga qoldirib, hal yon-tasma mandatiga: past-ustuvor o'qish (0000), past-ustuvor yozish (0100), flush (1010) va devor (1100).